Updated SYSTEM IMPACT STUDY OF NEW ENGLAND AREA

Transcription

1 CROSS SOUND CABLE PROJECT 330MW HVdc INTERCONNECTION BETWEEN NEW HAVEN, CONNECTICUT AND SHOREHAM, NY Updated SYSTEM IMPACT STUDY OF NEW ENGLAND AREA Subordinate Status Removal and Amendment of Approved NEPOOL SECTION 18.4 THERMAL & VOLTAGE ANALYSIS VOLUME 1 of 2 OCTOBER 2001 Prepared by TransÉnergie U.S. Ltd. 110 Turnpike Road, Suite 300 Westborough, MA

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3 Cross Sound HVdc Cable Project Executive Summary The Cross Sound Cable (CSC) is a 330 MW, HVdc interconnection between Shoreham on Long Island, New York and New Haven, Connecticut. System Impact studies were completed and conditional Subordinate Section 18.4 approval received from the New England Participants Committee in November 2000 based on the following Section 18.4 applications. This report assesses the impact of the CSC Project under Minimum Interconnection Standards (MIS) with other relevant queued resources that have received NEPOOL Section 18.4 approval since November 2000 and were not previously included in previous CSC studies. The intent is to remove the Subordinate approval status of the Project and to determine is any changes are required to the approved system upgrades for interconnection. The Section 18.4 approved Relevant Queued Resources in Connecticut that have a higher queue priority include Towantic, Wallingford, Meriden, and Lake Road. Other Relevant Queued Resources that the Cross Sound HVdc Cable Project is subordinate to such as AES Carpenter and Haddam Station are also included prior to these projects receiving Section 18.4 approval. Analysis indicates that replacement of a wave trap on the 1777 line is required with the relevant queued resource in the Connecticut area considered. Northeast Utilities has indicated that this is not a cost responsibility of the project and will be pursued by them. Analysis also indicates that the previously required addition of a 345 kv breaker at Scovill Rock 1 for a stuck breaker condition at Scovill Rock is no longer necessary. Concerns for this condition may be alleviated by modifying the currently approved 387 line-end-open (LEO) NPCC Type III that initiates runback the HVdc converter to also include runback of the facility for the Scovill Rock stuck 7T breaker condition. Full runback of the facility for either the 387 LEO or Scovill Rock 7T breaker condition is initially proposed. Since possible overload of local 115 kv transmission for either condition would only occur during export of power from Connecticut on the CSC Project, SPS runback under the CSC Project imports to Connecticut would be disabled. Based on the conditions studied, interconnection of the proposed Cross Sound HVdc Cable Project will not have a significant adverse impact on the New England bulk power system. The necessary system upgrades identified for the Project under MIS to remove the subordinate approval status of the CSC HVdc Project are as follows: Cross Sound SPS at Scovill Rock 2 - Installation of a Type III SPS at Scovill Rock 345 kv substation to runback the Cross Sound HVdc facilities for either o a 387 line-end-open condition at Scovill Rock or o a stuck 7T 345 kv breaker condition at Scovill Rock Replace wave trap on NU s 1777 line (N. Bloomfield x Bloomfield 115 kv) 1 Application NU-00-T25 will need to be withdrawn. 2 Application NU-00X26 will need to be revised. TransÉnergie U.S. Ltd.

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5 Cross Sound HVdc Cable Project Table of Contents Page 1.0 INTRODUCTION STUDY AREA AND INTERCONNECTION CONFIGURATION STUDY METHODOLOGY AND SYSTEM CONDITIONS System Load Representation Interfaces Modes of Operation of Cross Sound HVdc Cable EXPORT Mode: 330 MW New Haven to Shoreham Transfer IMPORT Mode: 330 MW Shoreham to New Haven Transfer Dispatches Sensitivity to Local Generation: Export Mode Only Sensitivity to New York New England Transfers Sensitivity to Millstone 1: Export Mode Only Contingency List Project Data Thermal-Voltage Guide STUDY RESULTS Thermal Analysis: Export Mode- Up to 330 MW from New Haven to Shoreham Peak Load Dispatch % Load Dispatch Sensitivity to Local CT Generation Sensitivity to New York-New England Transfers Sensitivity to Millstone 1: Export Mode Only Thermal Analysis: Import Mode- Up to 330 MW from Shoreham to New Haven Peak Load Dispatch % Load Dispatch Sensitivity to New York-New England Transfers Voltage Analysis: Export and Import Mode of Operation Cross Sound Cable SPS: Modified 387 LEO SPS Impact on Reactive Resources HVdc Converter AC Filter Bank Switching Subsynchronous Torsional Interaction SSTI SYSTEM UPGRADES REQUIRED CONCLUSIONS i TransÉnergie U.S. Ltd.

6 Cross Sound HVdc Cable Project APPENDIX I Study Area and Interconnection Configuration APPENDIX II Dispatch Summaries APPENDIX III Contingency List APPENDIX IV Project Data APPENDIX V System Dispatch Summary APPENDIX V Export Mode: 330 MW to Long Island Thermal Results Appendix Va Peak Load Level Appendix Vb 75% Load Level Appendix Vc Local CT Generation Sensitivity Appendix Vd NY-NE Transfer Sensitivity Appendix Ve Millstone 1 Sensitivity APPENDIX VI Import Mode: 330 MW From Long Island Thermal Results Appendix VIa Peak Load Level Appendix VIb 75% Load Level Appendix VIc NY-NE Transfer Sensitivity Appendix VId Millstone 1 Sensitivity APPENDIX VII Voltage Analysis VOLUME 2 Loadflow Summaries ii TransÉnergie U.S. Ltd.

7 Cross Sound HVdc Cable Project List of Tables Table 3.1 Export Mode Case Set..6 Table 3.2 Import Mode Case Set..7 Table 3.3 Peak Load with CT Generation Sensitivity: CSC HVdc 330 MW Net Export to Long Island Table Thermal Criteria Applied in Study Page Table Voltage Criteria Applied in Study Table 4.1 Summary of Transfer Levels With and Without Cross Sound HVdc Cable EXPORT Mode Transfers Connecticut to Long Island.13 Table 4.2 Summary of Transfer Levels With and Without Cross Sound HVdc Cable IMPORT Mode Transfers Long Island to Connecticut Table 4.3 Summary of Overloaded Resulting From Scovill Rock Stuck 7T Breaker Contingency..18 Table 4.4 Incremental Reactive Demand on Local Units...19 List of Figures Page Figure 2.1 Existing System...2 Figure 2.2 Previously Approved Cross Sound Cable Project Figure 5.1 Proposed Cross Sound Cable Project Interconnection. 21 iii TransÉnergie U.S. Ltd.

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9 Cross Sound HVdc Cable Project 1.0 INTRODUCTION The Cross Sound Cable (CSC) Project proposes the development of bi-directional +/- 150 kv HVdc Voltage Source Converter facilities and 23 miles of submarine cable with the ability to transfer up to 330 MW (net of losses) between the New England and Long Island electric power systems. The HVdc facilities will connect into the Shoreham 138 kv bus. Project inservice date is Summer System Impact studies were completed and conditional Subordinate Section 18.4 approval received from the New England Participants Committee in November 2000 based on the following Section 18.4 applications. TE R1 - Construct a 330 MW (net of losses), +/- 150 kv HVdc line and associated HVdc Converter Facilities. NU-00-T25 Scovill Rock Breaker Addition NU-00-X26 Cross Sound Cable SPS at Scovill Rock This report assesses the impact of the CSC Project with other relevant queued resources that have received NEPOOL Section 18.4 approval since November 2000 and were not previously included in previous CSC studies. The intent is to remove the Subordinate approval status of the Project and to determine is any changes are required to the approved system upgrades for interconnection. The relevant queued resources in Connecticut that have a higher queue priority than the CSC Project and associated approval status is listed below. Towantic - studies complete, 18.4 approval received Wallingford - studies complete, 18.4 approval received Meriden - studies complete, 18.4 approval received Lake Road - studies complete, 18.4 approval received Other Relevant Queued Resources that the Cross Sound HVdc Cable Project is subordinate to such as AES Carpenter and Haddam Station are included prior to these projects receiving Section 18.4 approval. This report summarizes the system impact of the project on the New England area thermal and voltage performance and has been prepared for review by the NEPOOL Transmission Task Force (TTF) to support a NEPOOL Section 18.4 Application (Subordinate) for the project under Minimum Interconnection Standards. 1 TransÉnergie U.S. Ltd.

10 Cross Sound HVdc Cable Project 2.0 STUDY AREA AND INTERCONNECTION CONFIGURATION The project facilities in New York (Long Island) will interconnect with the Long Island 138 kv electric transmission system adjacent to the decommissioned Long Island Power Authority (LIPA) Shoreham Nuclear Power Station. The HVdc facilities will connect into the Shoreham 138 kv bus. Appendix I provides information on the study area and interconnection of the HVdc cable and preliminary design of the HVdc facilities. The project facilities in Connecticut will interconnect with the New England 345 kv electric transmission system at New Haven, adjacent to the United Illuminating Company's existing East Shore kv Substation. The HVdc facilities would connect into the 387 (East Shore x Scovill Rock) 345 kv circuit via a single 345 kv breaker arrangement. Figures 2.1 and 2.2 show the existing system and the Section 18.4 approved interconnection to date. 353 to Manchester 353 to Manchester Middletown #4 W 4T 5T 7T 8T 376 to Haddam Neck Middletown #4 W 4T 5T 7T 8T 376 to Haddam Neck 387 Scovill Rock 345 kv Station *387 LEO SPS to runback HVdc 387 9T Scovill Rock 345 kv Station New Breaker and Line retermination New Haven HVdc Converter Facilities To Shoreham (LIPA) W W East Shore W W East Shore 115 kv 115 kv Figure Existing System 115 kv 115 kv Figure 2.2 Previously Approved Cross Sound Project Interconnection 2 TransÉnergie U.S. Ltd.

11 Cross Sound HVdc Cable Project The analysis of this report only addresses the impacts to the New England area. A separate report addressing the impact in New York was reviewed and approved by the NYISO Operating Committee in February STUDY METHODOLOGY AND SYSTEM CONDITIONS All studies were performed in conformance with the applicable NPCC, NEPOOL and local utility criteria on system representations derived from current library loadflows. The impact on the New England bulk power system was performed using the Power Technologies, INC. (PTI) Power System Simulator/Engineering (PSS/E) Program Package. The following sections describe the conditions for the thermal and voltage analysis conducted System Load Representation The system representation used in this analysis was based on loadflow cases provided by Northeast Utilities (NU) that were used in the analysis for the Haddam Neck Project (800 MW) in Connecticut 3. The cases from the Haddam Neck study reflect the most up-to-date cases available system representations of Connecticut and provide consistency of system impact study results from proposed Projects in the area. The cases represent a summer 2002 peak load (plus losses) of 24,174 MW and are consistent with the adjusted reference load of 24,140 in NEPOOL 2001 NEPOOL CELT report. Two load levels were evaluated, as based on the Haddam Neck study: 100% and 75% 4 of the anticipated summer peak load. The Connecticut area system modeled included the recently approved generation increases at Lake Road (840 MW), Towantic (549 MW), Meriden (560 MW) and Wallingford (255 MW). These facilities expected to be in-service by the year 2002 and were modeled in the same manner in which they were approved. In addition, Haddam Neck (800 MW) which is currently under review and AES Southington (786 MW) which has received both Stability Task Force (STF) and Transmission Task Force (TTF) approval, but has not yet been presented to the Reliability Committee (RC) for 18.4 approval, were included in the analysis. Existing generation in the local Connecticut area also includes the following units. Bridgeport Energy Bridgeport Harbor 2 and 3 Devon 7 and 8 Devon GTs 11,12,13, and 14 Norwalk Harbor 1 and 2 New Haven Harbor Middletown 2, 3 and 4 Milford Power English Units 7 & 8 3 System Impact Study for the Haddam Neck Project, Thermal and Short Circuit Report, May 2001, by Northeast Utilities Service Company 4 Intermediate load level is approximately 73% of the peak load and is based on Haddam Neck study cases. 3 TransÉnergie U.S. Ltd.

12 Cross Sound HVdc Cable Project 3.2. Interfaces Interfaces in the area of the Project that could be impacted by the Project include CT Import, CT Export, NY-NE and NE-NY. For consistency of system impact study results, the Haddam Neck cases with these interfaces stressed were used and modified as necessary to include the CSC HVdc Project Modes of Operation of Cross Sound HVdc Cable The CSC HVdc facilities are fully controllable and can transfer power in either direction between New Haven and Shoreham. Both import and export mode of operation was studied to investigate the bilateral transfer capability of the Project EXPORT Mode: 330 MW New Haven to Shoreham Transfer For the purpose of these studies, transfers up to 330 MW from Connecticut to Long Island, NY, is termed as the EXPORT Mode of operation for the Project. The 1385 Norwalk x Northport ac cable and phase shifter tie line between Connecticut and Long Island was scheduled for 200 MW to Long Island in the export mode cases. The Cross Sound HVdc was modeled as negative generator For cases where Cross Sound Cable (CSC) exporting to Long Island and CT was importing power, CSC HVdc was dispatched against Milford Power, Wallingford and or New Haven Harbor to maintain a similar CT Export interface loading with and without the Project. For cases where CT was exporting (maximum CT generation), no additional generation was dispatched with the Project in-service to maintain similar total CT Export and NY-NE transfers (total CT export = CT export + CSC export). Sensitivity to local CT generation, NY-NE transfer and Millstone 1 unit were included in the export mode analysis IMPORT Mode: 330 MW Shoreham to New Haven Transfer A transfer up to 330 MW in the reverse direction, from Long Island NY to Connecticut, is termed as the IMPORT Mode of operation for the Project. The 1385 Norwalk x Northport ac cable and phase shifter tie line between Connecticut and Long Island was scheduled for 0 MW to Long Island in the import mode cases. For cases where Cross Sound Cable (CSC) importing to Long Island, Cross Sound HVdc was dispatched against New Haven Harbor if in-service or Middletown #4 4 TransÉnergie U.S. Ltd.

13 Cross Sound HVdc Cable Project otherwise to maintain a similar CT Export interface loading with and without the Project. Sensitivity analysis was limited NY-NE transfer for the import mode Dispatches Testing followed same dispatch methodology used in the analysis of the Haddam Neck plant. Cases were developed with and with out the HVdc Project and for both modes of operation - Export and Import mode at both peak and 75% load levels. In addition, dispatches also considered conditions with and without Haddam Neck plant. For consistency between studies, Haddam Neck was dispatched against the same set on units used Haddam Neck study. Table 3.1 denotes the naming convention used for CSC HVDC operating in Export Mode. This case set includes sensitivity cases discussed in following sections. Cases with CSC in-service in export mode are prefixed with CSC-. Table 3.2 provides the case set used for CSC HVDC operating in Import Mode. Cases with CSC in-service are prefixed with CSCi-. Dispatch summaries of CT generation for case of Tables 3.1 and 3.2 are provided in Appendix II Full case summaries with area flow plots for all base condition loadflows used in the analysis are provided in Volume II. NY-NE positive is flow into NE on all ties and the CT Import/Export flow reported does not include the CSC HVdc project. The HVdc flow would be in addition to the reported values. 5 TransÉnergie U.S. Ltd.

14 Cross Sound HVdc Cable Project Table 3.1 Export Mode Case Set Dispatch Peak Load 75% Load Peak Load NY-NE Transfer Sensitivity Millstone #1 Sensitivity CT 115 kv Generation Dispatches CT Export/ Import Interface Export Import Export Import Import Export Import Export Export Import Export Haddam Neck Dispatched Against NY-NE Interface Transfer Loadflow Cases Without Project With Project Out-of-service Peakexp Csc-peakexp Montville, Midd#4, Meriden, AES Thames Pkex-1 Csc- pkex-1 Midd#4, Milford 0 Pkex-4 Csc- pkex-4 Out-of-service Peakimp Csc-peakimp Out-of-service Pkimp-1 Csc- pkimp-1 Midd#4, Milford, Meriden Pkimp-6 Csc- pkimp-6 Out-of-service Midexp Csc-Midexp Montville, Midd#4, Meriden, AES Thames Mdexp-1 Csc-Mdexp-1 Midd#4, Milford 0 Mdexp-4 Csc-Mdexp-4 Out-of-service Midimp Csc-Midimp Montville, Midd#4, Meriden, AES Thames Mdimp-1 Csc-Mdimp-1 Out-of-service NYNE7PKIMP CSC-NYNE7PKIMP Montville, Miid#4, Meriden, AES Thames NYNE7PKIMP-1 CSC-NYNE7PKIMP-1 Montville, Midd#4, 700 Meriden, AES Thames NYNE7PKEX CSC-NYNE7PKEX Montville, Midd#4, Meriden, AES Thames NYNE7PKEX-1 CSC-NYNE7PKEX-1 Out-of-service NENY7PKIMP CSC-NENY7PKIMP Montville, Miid#4, Meriden, AES Thames NENY7PKIMP-1 CSC-NENY7PKIMP Out-of-service NENY7PKEX CSC-NENY7PKEX Montville, Miid#4, Meriden, AES Thames NENY7PKEX-1 CSC-NENY7PKEX-1 Out-of-service Peakexp-M1 Csc-Peakexp-M1 Montville, Miid#4, Meriden, AES Thames Pkex-1-M1 Csc-Pkex-1-M1 Out-of-service 0 Midexp-M1 Csc-Midexp-M1 Montville, Miid#4, Meriden, AES Thames Mdexp-1-M1 Csc-Mdexp-1-M1 Out-of-service 700 NENY7PKIMP-2 CSC-NENY7PKIMP-2 Midd#4, Montville NENY7PKIMP-3 CSC-NENY7PKIMP-3 Out-of-service NENY7PKIMP-4 CSC-NENY7PKIMP-4 Out-of-service -700 NENY7PKIMP-5 CSC-NENY7PKIMP-5 Out-of-service NENY7PKIMP-6 CSC-NENY7PKIMP-6 Out-of-service -145 NENY7PKEX-2 CSC-NENY7PKEX-2 Midd#4, Montville -544 NENY7PKEX-3 CSC-NENY7PKEX-3 Out-of-service 425 NYNE7PKEX-2 CSC-NYNE7PKEX-2 Midd#4, Meriden 352 NYNE7PKEX-3 CSC-NYNE7PKEX-3 Midd#4, Milford, Meriden -171 Mdexp-6 CSC-Mdexp-6 Project Mode 330 MW Net Export from CT to Long Island 6 TransÉnergie U.S. Ltd.

15 Cross Sound HVdc Cable Project Table 3.2 Import Mode Case Set Dispatch Peak Load 75% Load Peak Load NY-NE Transfer Sensitivity CT Export/ Import Interface Export Import Export Import Import Export Import Export Haddam Neck Dispatched Against Out-of-service Midd#4, Meriden, AES Thames Out-of-service Midd#4, Meriden, AES Thames NY-NE Interface Transfer Without Project Ipeakexp Ipkex-2 Ipeakimp Ipkimp-2 Loadflow Cases With Project Csc-peakexp Csc- pkex-1 Csci-peakimp Csci- pkimp-2 Out-of-service Montville, Midd#4, 0 Imidexp Csci-Midexp Meriden, AES Thames Imdexp-2 Csci-Mdexp-2 Out-of-service Montville, Midd#4, -165 Imidimp Csc-Midimp Meriden, AES Thames Idimp-1 Csci-Mdimp-1 Out-of-service 290 INYNE7PKIMP CSCI-NYNE7PKIMP Meriden, AES Thames 490 INYNE7PKIMP-2 CSCI-NYNE7PKIMP-2 Midd#4, Meriden, AES Thames INYNE7PKEX CSCI-NYNE7PKEX 700 Montville, Miid#4, Meriden, AES Thames INYNE7PKEX-2 CSC-NYNE7PKEX-2 Out-of-service Montville, Midd#4, -900 NENY7PKIMP CSC-NENY7PKIMP Meriden, AES Thames NENY7PKIMP-2 CSCI-NENY7PKIMP-2 Out-of-service NENY7PKEX CSCI-NENY7PKEX Montville, Midd#4, -700 Meriden, AES Thames NENY7PKEX-1 CSCI-NENY7PKEX-2 Project Mode 330 MW Net Import from Long Island 7 TransÉnergie U.S. Ltd.

16 Cross Sound HVdc Cable Project Plant Sensitivity to Local Generation: Export Mode Only The following Table 3.3 summarizes system dispatches used in the analysis to test the sensitivity to local generation near the project with a net 330 MW transfer from CT to Long Island on the CSC HVdc. These dispatches test possible impact of the CSC HVdc project on the system for various outage scenarios of the New Haven Harbor, Middletown #4, Wallingford, English and Towantic plants at peak load. Two similar dispatches were also developed for the 75% load level having New Haven Harbor, Middletown #4 and the English units out-of-service, and with and without Haddam Neck in-service. Corresponding base system dispatches with out the Project are provided in Appendix II. Similar analysis for import mode operation was not considered necessary under minimum interconnection standards. Under import mode, the project was dispatched against New Haven Harbor or Middletown #4, as required. CSC- NYNE7PKIMP-2 Table 3.3 Peak Load with Local CT Generation Sensitivity: CSC HVdc 330 MW Net Export to Long Island CSC- NYNE7PKIMP-3 CSC- NENY7PKIMP-4 CSC- NENY7PKIMP-5 CSC- NENY7PKIMP-6 Case Names CSC- NENY7PKEX-2 CSC- NENY7PKEX-3 CSC- NYNE7PKEX-2 CSC- NYNE7PKEX- 3 English Units (#7&8) New Haven Middletown Wallingford Towantic Haddam Neck Bridgeport Milford Bridgeport Energy Lake Road Meriden AES Southington Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Sensitivity to New York New England Transfers Dispatches were developed in the analysis to test the sensitivity to the New York New England transfers with and without the CSC HVdc project in-service under both export and import mode of operation. NY-NE transfers at peak load within a range of about +/- 700 MW and were based on similar dispatches from the Haddam Neck analysis. Dispatches used in the analysis are summarized in Appendix II. 8 TransÉnergie U.S. Ltd.

17 Cross Sound HVdc Cable Project In addition to this, the TWG asked analysis of the NY-NE transfer capability with and without the CSC HVdc Project. This linear Transfer Interchange Limit analysis was performed using TLTG activity of the PSS/e program Sensitivity to Millstone 1: Export Mode Only Dispatches were developed to test sensitivity to the Millstone 1 unit at both peak and 75% load levels. This 650 MW nuclear unit was shut down in 1996 for decommissioning, but no Section 18.4 application for retirement has been submitted on behalf of the plant. Until submitted, this unit should be considered in analysis of the system. Sensitivity with the Millstone 1 unit, and with and without Haddam Neck and with and without CSC HVdc was performed for CSC HV operating in export mode with a net 330 MW transfer from CT to Long Island. Similar analysis for import mode operation was not considered necessary. Dispatches used in the analysis are summarized in Appendix II Contingency List Both normal design and extreme contingencies, required by NPCC, NEPOOL Reliability Standards and local utility criteria were tested. Appendix III provides the list of contingencies tested Project Data PTI is in the process of developing a Voltage Source converter HVdc model for the PSS/E program. Since the model was not available, a two generator method was used to model the CSC Project in the program. This model assumes the sending end (rectifier) output of 346 MW and a receiving end (inverter) output of +330 MW. The 16 MW difference is to account for HVDC system losses of the Project. For transfers in the opposite direction the output of the generators are interchanged. The net reactive capability of the Project is approximately +/- 72 MVars delivered to the high side (ac system side) of the converter transformer. This amount includes about MVars of ac filters connected to the ac filter bus and necessary for the operation the HVdc facility. The reactive capability of the inverter is slightly higher (approx. +/-90 MVars) than that of the rectifier. Output of the fictitious generators representing the HVdc facilities at New Haven was kept within this approximate range for the studies. The ac filter bus of each converter is controlled to 200 kv and connected the ac system through three single phase 120 MVA converter transformers. The system model in the study used the following for the converter transformer. 5 Note initial design was 105 MVar was used in study. Current design is 103 MVar comprised of one 61 MVar, one 32 MVar and one 10 MVar bank. Net reactive capability to the system remains the same. 9 TransÉnergie U.S. Ltd.

18 Cross Sound HVdc Cable Project Rated Voltage = (New Haven), (Shoreham) Tap Changer = secondary, +/- 14 steps, 1.5% each step Impedance=17.4 % on 360 MVA Additional Project data for the HVdc facilities is provided in Appendix III Thermal-Voltage Guide The thermal and voltage analysis used guidelines set forth in the Reliability Standards for NEPOOL, United Illuminating Company Transmission Planning Criteria 6 and Northeast Utilities Planning Standards 7. Table 3.4 identifies the thermal criteria applied. Table 3.5 identifies the voltage criteria applied. NU has additional guidelines that the Millstone 345 kv voltage should not fall below 1.0 pu post-contingency. Postcontingency incremental differences with and without the project were used to determine the impact of the project. Increase in flow of greater than 1% for thermal analysis and differences greater than 0.5% for voltage analysis resulted in further investigation of the results. Table 3.4 Thermal Criteria Applied in Study SYSTEM CONDITION TIME FRAME MAXIMUM ALLOWABLE FACILITY LOADING Pre-contingency (All Lines In) Post-contingency Continuous Normal Rating Less than 15 minutes see note 1 after contingency occurs STE Rating More than 15 minutes after contingency occurs LTE Rating Note 1) Post-contingency loadings above Long Term Emergency (LTE) rating, but below Short Term Emergency (STE) rating were considered acceptable as long as prompt action (local phase shifter adjustment or generation runback) could reduce all facility loadings below LTE within 15 minutes. Operation of existing special protection systems (SPS) were used, where available, to alleviate overload conditions. Table 3.5 Voltage Criteria Applied in Study All Lines Single Contingency Overlapping In Contingencies High Limit 1.05 pu +5%, maximum 1.05 pu +10%, maximum 1.05 pu Low Limit 0.95 pu -5%, minimum 0.95 pu -10%, minimum 0.9 pu 6 Transmission Planning Criteria, Planning Department dated April 23, Transmission Reliability Standards for Northest Utilities, May TransÉnergie U.S. Ltd.

19 Cross Sound HVdc Cable Project 4.0 STUDY RESULTS Some facilities in the study area are protected by Special Protection Systems (SPS) that result in an automatic action upon detection of an overload. The following SPSs were included in the study and were found to alleviate overloads seen on the associated circuits. Operation of the SPSs did not result in additional facilities being overloaded. Also included is the approved 387 LEO SPS that is associated with the CSC HVdc project SPS Opens R-5 circuit switcher at Ansonia for loading above the 150 MVA LTE rating on 1570 (Derby x Indian Wells 115 kv) following loss of 1545 (Devon x trap Falls 115 kv) 1870 SPS- trips 1870 (Mystic x Wood River 115 kv) for directional flow on 1870 line from Wood River above 110 MVA 1732 SPS opens 1732 line (Canton x Weingart Jct x Campville 115 kv) at Canton for 1732 line flow above 107 MVA LTE rating 387 LEO SPS 8 Runback the CSC HVdc to 0 MW flow for 387 (East Shore x CSC HVdc x Scovill Rock 345 kv) line-end-open (LEO) at Scovill Rock 345 kv Substation It should be noted that NU has a Canton-Weingart 18.4 Study currently under review and proposes to upgrade the 1732 circuit to 1272 kcmil ACSR conductor with a expected rating of 297/382/434 MVA for normal/lte/ste. The associated 1732 SPS would be removed after reconductoring. No 1732 loading shown in this analysis would exceed the new 1732 line ratings. Loss of the CSC HVdc project was included in all analysis performed and no overload condition was experienced. This is based on the existing 1385 connection between Norwalk and Northport on Long Island with a summer normal/lte/ste rating of 270/335/450 MVA as provided by LIPA and NU. Thermal results are discussed in the following sections and are summarized in tables of Appendix V and VI LEO SPS was identified as a requirement for the CSC HVdc Project and received Section 18.4 approval based on previous study of the project. 11 TransÉnergie U.S. Ltd.

20 Cross Sound HVdc Cable Project 4.1. Thermal Analysis: Export Mode- Up to 330 MW from New Haven to Shoreham Peak Load Dispatch Facilities where postcontingency thermal loadings exceed 99% of the LTE rating for conditions with net transfers of 330 MW on the CSC HVdc from New Haven to Shoreham were reviewed for the peak load dispatches. All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. Some loadings above the LTE rating were noted with and without the Project. These overloads would be resolved by insertion of reactors associated with other generator projects and switching operations. No new system upgrades for the CSC HVdc project were identified. Peak load thermal results, with and without the CSC HVdc project, are summarized in Appendix Va % Load Dispatch All postcontingency loading violations with and without the CSC HVdc project were within the +1% comparison criteria. The 1732 SPS would be expected to operate for several contingencies with or without the CSC HVdc project. As noted before, if the 1732 line is upgraded, the new ratings would be adequate for the flows seen in this analysis. No new system upgrades for the CSC HVdc project were identified. 75% load thermal results, with and without the CSC HVdc project, are summarized in Appendix Vb Sensitivity to Local CT Generation Analysis of this section was performed to determine impact of the project when certain local generation may be unavailable. The more critical conditions are when either or both New Haven Harbor and Middletown #4 are off-line. Analysis confirms the system upgrades previously required by the project, namely the 387 LEO SPS and the addition of a 345 kv breaker at Scovill Rock. The 387 LEO SPS would be expected to operate for several of the system dispatches in this analysis where New Haven Harbor generation was off-line and the CSC HVdc project in-service. Runback of the CSC HVdc would alleviate overloads seen in this analysis. It should also be noted that runback of the CSC HVdc would also alleviate any overloads that may be associated with the Scovill Rock stuck 7T breaker contingency. This is discussed in more detail in Section 4.4. With the system upgrades previously required by the project, all postcontingency loading violations with and without the CSC HVdc project were within the +1% comparison criteria with the exception to the 1777 circuit (N. Bloomfield x Bloomfield 115kV). Incremental increase in load on this circuit postcontingency with the project in-service was about 2%. Although this circuit may become overloaded without the 12 TransÉnergie U.S. Ltd.

21 Cross Sound HVdc Cable Project CSC HVdc Project following a simultaneous loss of either the 1207 and 1775 circuits or the 395 and 1751 circuits, Northeast Utilities indicated that upgrade of the 1777 circuit should be considered a requirement of the CSC HVdc project. Overload seen on the 1777 circuit may be alleviated by replacement of a limiting 115 kv wave trap. The line would become conductor limited at 178/228/242 MVA with replacement of the wave trap. Northeast Utilities has indicated that it will pursue the wave trap replacement, but that the project will not be responsible for the cost. Thermal results, with and without the CSC HVdc project, are summarized in Appendix Vc Sensitivity to New York-New England Transfers All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. The 1732 SPS would be expected to operate for several contingencies with or without the CSC HVdc project. As noted before, if the 1732 line is upgraded, the new ratings would be adequate for the flows seen in this analysis. The 1777 wave trap line limitation noted for the 75% load analysis was also seen in one case dispatch (csc-neny7pkimp-1 & neny7pkimp-1) with and without the CSC HVdc project. No new additional system upgrades for the CSC HVdc project were identified. Thermal results, with and without the CSC HVdc project, are summarized in Appendix Vd. Table 4.1 summaries impact on the NY-NE interface with and without the CSC HVdc project. As shown in the table, the Project does not result in any significant adverse impact ( 1%) to the transfer capability. The project does increase the transfer capability with New York. Table 4.1 Summer Transfer Levels With and Without Cross Sound HVdc Cable EXPORT Mode: Transfers Connecticut to Long Island Summer Normal Transfer Direct Tie Limit (MW) 1 Summer Emergency Transfer Direct Tie Limit (MW) 1 With Without See With Project Without See Interface Project Project Note Project Note ISONE NYISO /1116* /1524* NYISO ISONE *With Cross Sound HVdc tie flow included Notes: 1) Cross Sound HVdc Project at 330 MW net export from Connecticut cable (Northport Norwalk) at 200 MW export from Connecticut. 2) 395 Ludlow-Meekville-Manchester at 1605 LTE rating for loss of 347S line (Lake Road Card 345kV) SPS. 3) Pleasant Valley-Long Mountain 345kV at 1317 LTE rating for loss of Seabrook G1 13 TransÉnergie U.S. Ltd.

22 Cross Sound HVdc Cable Project 4) Pleasant Valley-Long Mountain 345kV at 1135 normal rating for no contingency Sensitivity to Millstone 1: Export Mode Only All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. Loss of the 398 line (Long Mountain Pleasant Valley 345 kv) resulted in a loading of about 109% of LTE on the 1385 (Norwalk Harbor Northport 138 kv) tie line with LIPA only for conditions without the CSC HVdc project. With the project in-service the loading was less than 99% of LTE. Thermal results, with and without the CSC HVdc project, are summarized in Appendix Ve Thermal Analysis: Import Mode- Up to 330 MW from Shoreham to New Haven Peak Load Dispatch Facilities where postcontingency thermal loadings exceed 99% of the LTE rating for conditions with net transfers of 330 MW on the CSC HVdc from Shoreham to New Haven were reviewed for the peak load dispatches. All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. Some loadings above the LTE rating were noted with and without the Project. These overloads could be resolved by insertion of reactors associated with other generator projects and switching operations. The 1732 SPS would be expected to operate for several contingencies with or without the CSC HVdc project. No new system upgrades for the CSC HVdc project were identified. Peak load thermal results, with and without the CSC HVdc project, are summarized in Appendix VIa % Load Dispatch All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. The 1732 SPS would be expected to operate for several contingencies with or without the CSC HVdc project. No new system upgrades for the CSC HVdc project were identified. 75% load thermal results, with and without the CSC HVdc project, are summarized in Appendix VIb Sensitivity to New York-New England Transfers All postcontingency loadings with and without the CSC HVdc project were within the +1% comparison criteria. The 1732 SPS would be expected to operate for several contingencies with or without the CSC HVdc project. As noted before, if the 1732 line is upgraded, the new ratings would be adequate for the flows seen in this analysis. No new system upgrades for the CSC HVdc project were identified. Thermal results, with and without the CSC HVdc project, are summarized in Appendix VIc. 14 TransÉnergie U.S. Ltd.

23 Cross Sound HVdc Cable Project Table 4.2 summaries impact on the NY-NE interface with and without the CSC HVdc project. As shown in the table, the Project does not result in any significant adverse impact ( 1%) to the transfer capability. The project does increase the transfer capability with New York. Table 4.2 Summer Transfer Levels With and Without Cross Sound HVdc Cable IMPORT Mode: Transfers Long Island to Connecticut Summer Normal Transfer Direct Tie Limit (MW) 1 Summer Emergency Transfer Direct Tie Limit (MW) 1 With Without See With Project Without See Interface Project Project Note Project Note ISONE- NYISO NYISO- ISONE 1363 /1693* *With HVDC tie flow included /2407* Notes: 1) Cross Sound HVdc Project at 330 MW net export to Connecticut cable (Northport-Norwalk) at 0 MW import from Connecticut. 2) 395 Ludlow-Meekville-Manchester at 1605 LTE rating for loss of 347S line (Lake Road Card 345kV) SPS. 3) 1385 Northport-Norwalk at 335 LTE rating for loss of 398 line (Pleasant Valley-Long Mountain 345kV) and 321 line (Long Mountain-Plum Tree 345kV). 4) 1385 Northport-Norwalk at 450 STE rating for loss of 398 line (Pleasant Valley-Long Mountain 345kV) and 321 line (Long Mountain-Plum Tree 345kV) Voltage Analysis: Export and Import Mode of Operation For conditions studied, the postcontingency voltage profile in the southwestern Connecticut area demonstrated signs of a weak supply for the existing system as has been found in previous studies of the area. The CSC HVdc project slightly aggravated this area under some conditions with postcontingency voltages with the project in-service generally less than +/- 1% of the voltages without the project. Consistent with the Haddam Neck studies, the following contingencies in the southwestern CT resulted in voltage violations with post contingency voltages below 0.9 pu for many of the dispatches reviewed. loss of 1770 (Plum Tree x Stony Hill x Bates Rock 115 kv) results in low voltages in the Shepaug and Bates Rock area simultaneous loss of 1710 and 1730 (Devon x Old Town x Pequonnock 115 kv and Devon x Hawthorn x Pequonnock 115 kv) results in low voltages at the Hawthorn and Old Town substations (becomes radial feed from Norwalk 115 kv) simultaneous loss of 1770 and 321 (Plum Tree x Stony Hill x Bates Rock 115 kv and Long Mountain x Plum Tree 345 kv) results in low voltages in the Shepaug and Bates Rock area 15 TransÉnergie U.S. Ltd.

24 Cross Sound HVdc Cable Project It should be noted that NU is currently investigating the addition of reactive compensation in the area to address poor voltage performance and ISO-NE is also conducting a Southwest Connecticut reliability study to address concerns in the area. Considering the overall voltage performance in the southwest CT area following these contingencies, the CSC HVdc project is not responsible for correcting system voltage. For the rest of the Connecticut postcontingency voltage profiles for either Export or Import mode of operation of the CSC HVdc project were within acceptable limits or within 0.5% of the cases without the project. Voltage analysis results for voltage violations comparing of the impact with and without the project are provided in Appendix VI Cross Sound Cable SPS: Modified 387 LEO SPS As noted in Section 4.1.3, previous Section 18.4 approval of the project required the addition of a new 345 kv breaker at Scovill Rock to avoid loss of both 353 and 376 circuits for failure of the 7T breaker in addition to the 387 LEO SPS. When the CSC HVdc project was downsized from 600 MW to 330 MW, the impact of the Scovill Rock 7T breaker contingency was not evaluated due to uncertainty with other relevant queued resources that had not had studies completed at the time. The local 115 kv transmission serving the New Haven area load may exceed emergency ratings under very limited system conditions of high CT area load, heavy CT power transfers, export to NY via the Project and no local generation at New Haven Harbor. If New Haven Harbor is available, the 387 LEO is not a concern. Operation of the 387 LEO SPS to runback the HVdc facilities would alleviate thermal overload concerns. It is under similar conditions with New Haven Harbor unavailable that the stuck 7T 345 kv breaker at Scovill Rock resulting in the loss of the 353 (Scovill Rock x Manchester 345 kv) and 376 (Scovill Rock x Haddam Neck 345 kv) circuits could result in a possible overload of (Sackett x Mix Ave 115 kv) and Sackett phase shifter. Under this condition as with the 387 LEO, power transfer on the CSC HVdc is supplied entirely from the local 115 kv transmission. Results of the current analysis with the relevant resources included indicate postcontingency loadings associated with the Scovill Rock 7T breaker contingency are within 2% of the LTE rating of facilities and below STE rating. This is significantly less of an impact as was previously expected when the CSC HVdc project was 600 MW, where several transmission facilities could be expected to be a concern above STE rating. Table 4.3 summarizes all conditions where the Scovill Rock 7T breaker contingency resulted in loadings at or above LTE ratings based on the current analysis of this report. These overloads may also be alleviated by runback of the CSC HVdc. An alternative to the approved Scovill Rock breaker upgrade is modification of the approved 387 LEO SPS to include 7T breaker failure indication as another runback trigger. This may be 16 TransÉnergie U.S. Ltd.

25 Cross Sound HVdc Cable Project easily accomplished and would require same runback indication signal as the 387 LEO condition. The proposed Cross Sound Cable SPS would initiate runback to 0 MW for either a 387 LEO condition (open 5T and 8T breaker at Scovill Rock) or backup breaker failure of 7T breaker and only is required when CSC HVdc is operating in the export mode. For simplicity, runback to 0 MW is considered. Additional operational analysis may be conducted at a later date to determine if another level runback may be implemented that would cover both the 387 LEO and the 7T stuck breaker condition. SPS Triggering and Arming - The proposed SPS would be armed 100% of the time and triggered by breaker status of the breakers associated with the 353, 376 and 387 circuits at Scovill Rock. Operation of the SPS would result in full runback of the HVdc facilities to 0 MW under export mode transfer from CT on the CSC HVdc facilities. SPS operation would be blocked when CSC HVdc is operating in import mode. Inadvertent SPS Operation - The resulting impact to the interconnected system for an inadvertent operation of the SPS to runback the HVdc facilities would be similar to loss of the Project. It has been demonstrated in system impact studies that loss of the Project would have no adverse impact to either the New York or New England systems. Failure of SPS to Operate - Failure of the SPS to operate during HVdc export to Long Island and during heavy system stress conditions of high CT area load, heavy CT power transfers could result in overload on local 115 kv transmission serving the local New Haven area loads. Depending on local CT generation dispatch and assuming the local New Haven Harbor unit is unavailable, this may result in loadings of about 100% to 102 % of the LTE rating on the 88005A and 88005B 115 kv circuits (Devon Switching Station Milvon) and (Sackett - Mix Ave) 115 kv transmission loaded above LTE, but below STE rating. Manual runback of the HVdc facilities in event of a failure of the SPS to operate may be initiated to alleviate overloads. Impact would be limited to the local CT area. NPCC SPS TYPE Type III - No inter-area impact results for either failure of the SPS to operate when required or from inadvertent SPS operation. As noted above, it is only during limited system conditions of high CT area load, heavy CT power transfers, export to NY on the Project and no local generation at New Haven Harbor and/or Middletown #4 that there may be a need for the Cross Sound Cable SPS to operate. 17 TransÉnergie U.S. Ltd.

26 Cross Sound HVdc Cable Project Table 4.3 Summary of Overload Conditions Resulting From Scovill Rock Stuck 7T Breaker Contingency Cross Sound Export Mode 330 MW Net to Long Island Cases with New Haven Harbor, Middletown #4 and English #7&8 Off-Line (Wallingford, Milford, Bridgeport, Towantic on-line) LIMITING Normal/LTE/STE % LOADFLOW CASE COMPARISON LINE BUS NAME BUS NAME CONTINGENCY RATING FLOW LTE neny7pkex-2 and *SACKETT SACKPHS SCVRK_7T_STK 129/138/ csc-neny7pkex SACKPHS *MIX AVE SCVRK_7T_STK 129/138/ neny7pkex-3 and *SACKETT SACKPHS SCVRK_7T_STK 129/138/ csc-neny7pkex SACKPHS *MIX AVE SCVRK_7T_STK 129/138/ neny7pkimp-4 and *SACKETT SACKPHS SCVRK_7T_STK 129/138/ csc-neny7pkimp SACKPHS *MIX AVE SCVRK_7T_STK 129/138/ nyne7pkimp-2 and SACKPHS *MIX AVE SCVRK_7T_STK 129/138/ csc-nyne7pkimp A 3688 *MILVON A DEVON SCVRK_7T_STK 221/284/ nyne7pkimp-3 and SACKPHS *MIX AVE SCVRK_7T_STK 129/138/ csc-nyne7pkimp A 3688 *MILVON A DEVON SCVRK_7T_STK 221/284/ B 3689 *MILVON B DEVON SCVRK_7T_STK 221/284/ Notes: 1) SCVRK_7T_STK = Scovill Rock Stuck 7T breaker. Results in loss of 353 and 376 circuits from Scovill Rock. As such, Scovill Rock become radial to East Shore. 2) Runback of Cross Sound HVdc alleviates all overloads. 3) Scovill Rock stuck 7T breaker is a concern only for Cross Sound HVdc exporting to Long Island. Import mode into Connecticut is not a concern. 18 TransÉnergie U.S. Ltd.

27 Cross Sound HVdc Cable Project 4.5. Impact on Reactive Resources To prevent voltage instability of the Connecticut area, guidelines have been developed for the reactive output of generation at Millstone, Montville #6, Middletown #4 and New Haven Harbor. The Millstone units should be limited to about 150 MVAr output and the Montville and Middletown units to about 60 MVAr. The guidelines were developed prior to the approval of new generation in the area that includes Towantic, Milford, Wallingford, Lake Road, Meriden etc. which will support the reactive demands of the system. The associated I 2 X losses for a 330 MW net export (346 MW with losses) via the CSC HVdc project could increase the reactive demand on these units above these levels for conditions when closest unit of New Haven Harbor or others are not available. To determine the amount of incremental reactive demand from the 330 MW transfer, the Millstone, Middletown #4 units one Meriden unit were run as synchronous condensers and the MVAR output compared with and without the HVdc project in-service. The New Haven Harbor unit, English units and the Haddam Neck were not in-service. The 103 MVar of ac filters required by the HVdc facilities are modeled in this analysis. Table 4.4 summarizes the incremental reactive demand. About 12 MVar less is required from the local units with the HVdc in-service, based on a net 65 MVar flow from the HVdc facilities. This may be considered a worse case scenario for reactive demand in the area. Table 4.4 Incremental Reactive Demand on Local Units Generator No HVdc With HVdc Delta Unit MW MVAR MW MVAR MW MVAR Middletown # Montville New Haven Harbor Millstone # Millstone # Wallingford Haddam Neck Meriden Towantic CSC HVdc net at 345 kv East Shore Total Notes: 1) Information based on peak load conditions with (case csc-neny7pkimp-4) and without HVdc (case neny7pkimp-4). Units run as synchronous condensers scheduled to control pu voltage for this analysis. 2) 103 MVar of filters at East Shore HVdc converter modeled. HVdc facility delivers a net of 65 MVar to the system. 4) Loadflow model includes 16 MW of losses for HVdc facilities. 19 TransÉnergie U.S. Ltd.

28 Cross Sound HVdc Cable Project 4.6. HVdc Converter AC Filter Bank Switching Present design includes the installation of 1X 61 MVar filter bank (25 th harmonic), 1 x 32 Mvar filter bank ( 41 st harmonic) and 1 x 10 MVAr ( 21 st harmonic) to be located at the East Shore Converter terminal with a similar design for the Shoreham converter. The 32 MVar and 10 MVar banks are switched together with the converter transformer when connecting to the ac system. The 61 MVar bank will be switched separately by a separate breaker during deblock and ramping of the HVdc converter. Powering down would be in the reverse order. Based on a weak system with New Haven Harbor and Wallingford out of service and the 387 line open at Scovill Rock, switching the largest bank (61 MVar) would result in a 2% voltage change at the East Shore 115 kv bus. This is a worse case scenario and not an expected mode of operation with 387 out-of-service. Harmonic impact on local electric railroad filters/capacitors and impacts on high voltage capacitor switching is not included as part of the scope of this study and will be investigated in a separate study reviewed by ISO-NE, UI, NU and their respective consultants Subsynchronous Torsional Interaction SSTI Subsynchronous torsional interaction (SSTI) of the HVdc with local generation is not included as part of the scope of this study and will be investigated in a separate study reviewed by ISO-NE, UI, NU and their respective consultants. 5.0 SYSTEM UPGRADES REQUIRED System upgrades identified in this analysis are as follows Upgrade of the 1777 line wave trap Scovill Rock SPS (NPCC Type III) to runback the CSC HVdc facilities under export mode to 0 MW for the following conditions o 387 LEO at Scovill Rock o Stuck 7T breaker at Scovill Rock Figure 5.1 illustrates the new proposed interconnection for the Cross Sound HVdc Project without the Scovill Rock breaker addition and 376 line retermination previously approved under Section TransÉnergie U.S. Ltd.

29 Cross Sound HVdc Cable Project 353 to Manchester Middletown #4 4T 7T W 5T 8T 376 to Haddam Neck 387 Scovill Rock 345 kv Station* New Haven HVdc Converter Facilities To Shoreham (LIPA) Additional Upgrades *Cross Sound SPS - HVdc runback for 387 LEO or stuck 7T breaker at Scovill Rock ** Replace wave trap on 1777 line W W East Shore 115 kv 115 kv Figure 5.1 Current Proposed Cross Sound Cable Project Interconnection 21 TransÉnergie U.S. Ltd.

30 Cross Sound HVdc Cable Project 6.0 CONCLUSIONS Analysis indicates that one new additional system reinforcement to replace the 1777 line wave trap is required to remove the subordinate status of the Project when considering the Relevant Queued Resources that have a higher priority to the CSC HVdc Project. The analysis also indicates that the previously required addition of a 345 kv breaker at Scovill Rock 9 for a stuck breaker condition at Scovill Rock is no longer necessary. Concerns for this condition may be alleviated by modifying the currently approved 387 line-end-open (LEO) NPCC Type III SPS 10 that initiates runback the HVdc converter to also include runback of the facility for the Scovill Rock stuck 7T breaker condition. Full runback of the facility for either the 387 LEO or Scovill Rock 7T breaker condition is initially proposed. Based on the conditions studied, interconnection of the proposed Cross Sound HVdc Cable Project will not have a significant adverse impact on the New England bulk power system. 9 Section 18.4 application NU-00-T25. This application would be withdrawn. 10 Section 18.4 application NU-00-X26. This application would have to be revised as stated. 22 TransÉnergie U.S. Ltd.

31 APPENDIX I Study Area and Interconnection Configuration

32

33 Maximum Transfer Capability MW Net* 353 to Manchester 4T 5T 7T 8T ** 376 to Haddam Neck Approximately 23 statute miles Shoreham 138kV Converter HVDC Cable ( +150 kv ) Converter ** Wildwood Wading River Breaker & Disconnects AC Filters HVDC Cable ( -150 kv ) AC Filters Brookhaven Miller Place New Haven Converter Station Shoreham Converter Station NOTES: * 330 MW Net (330 MW + 16 MW losses = 346 MW) ** Does not include breaker addition approved. Alternative: SPS to runback HVdc for 387 LEO or stuck 7T breaker Figure 1 - Simplified One-line of Proposed Cross Sound Cable HVDC Transmission System

34 We reserve all rights in this document and in the information contained herein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden. ABB Power Systems (SE) =WT =U -T1 -T2 -Q2 -L1 -Q11 -Q1 -R2 -T11 -F1 -C1 -VA -VB -VC =WP1 -R1 -L2 -C2 -Z1 -Z1 -Z1 -L1 -Q11 -T1 -T kv -Z1 -T1 -T1 -T1 -V1 -C1 -V1 -C1 -V1 -C1 -C1 -U1 -F1 -Q21 -T4 -T4 -T4 =WZ -V2 -V5 -V2 -V5 -V2 -V5 200 kv -Q11 -C3 -L2 -L1 -T1 -L1 -X1 -T3 -Z3 -T3 -Z3 -T3 -Z3 -L2 -Q21 -Z1 -F1 -T11 -C2 -Q1 -C1 -T1 -Z11 -Z12 -C1 -C1 -Z13 -C1 -V3 -T5 -V6 -V3 -T5 -V6 -V3 -T5 -V6 -C2 =WP2 -T2 -T2 -T2 -V4 -C2 -V4 -C2 -V4 -C2 -L1 -Q11 -T1 -T2-150 kv -T2 -T2 -T2 -R1 -L1 -F1 -R1 -L1 -F1 -R1 -L1 -F1 -U1 -F1 -Q21 -T1 -T1 -T1 -Z2 -Z2 -Z2 vss$/lss/projects/cross Sound Cable/SLD CSC1_NewHaven.hgf Directory: Name: 07 HF circuit added in V areas (-Z3). WB area removed. LSS/JW Two new derivative measuring devices added in V areas (-T4 and -T5). LSS/JW Rev Ind Arrester =WT-F1 changed to capacitor =WT-C1. Transformer =WT-T1 redrawn and renamed. HF blocking filters added in area U. Revision 25 th 61 MVAR 41 st 32 MVAR 21st LSS/AH LC/LR Appd Year Week 10 MVAR Design checked by T. Tulkiewicz / LST Drawing checked by J. Wasborg / LSS Drawn by T. Björk / LSS Note: All disconnectors (Q1x), and earthing switches (Q2x) are motor operated. Single Line Diagram Cross Sound Cable, New Haven HVDC Light B 332 ABB POWER SYSTEMS AB Iss by Dept LSS Year Week JNL Rev Ind Rev Ind 07 Sheet 1 Cont -

35 We reserve all rights in this document and in the information contained herein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden. ABB Power Systems (SE) =WT =U -T1 -T2 -Q2 -L1 -Q11 -Q1 -R2 -T11 -F1 -C1 -VA -VB -VC =WP1 -R1 -L2 -C2 -Z1 -Z1 -Z1 -L1 -Q11 -T1 -T kv -Z1 -T1 -T1 -T1 -V1 -C1 -V1 -C1 -V1 -C1 -C1 -U1 -F1 -Q21 -T4 -T4 -T4 =WZ -V2 -V5 -V2 -V5 -V2 -V5 200 kv -Q11 -C3 -L2 -L1 -T1 -L1 -X1 -T3 -Z3 -T3 -Z3 -T3 -Z3 -L2 -Q21 -Z1 -F1 -T11 -C2 -Q1 -Q2 -C1 -T1 -Z11 -Z12 -C1 -C1 -Z13 -C1 -V3 -T5 -V6 -V3 -T5 -V6 -V3 -T5 -V6 -C2 =WP2 -T2 -T2 -T2 -V4 -C2 -V4 -C2 -V4 -C2 -L1 -Q11 -T1 -T2-150 kv -T2 -T2 -T2 -R1 -L1 -F1 -R1 -L1 -F1 -R1 -L1 -F1 -U1 -F1 -Q21 -T1 -T1 -T1 -Z2 -Z2 -Z2 25 th 61 MVAR 41 st 32 MVAR 21st 10 MVAR vss$/lss/projects/cross Sound Cable/SLD CSC1_Shoreham.hgf Directory: Name: 07 HF circuit added in V areas (-Z3). WB area removed. LSS/JW Two new derivative measuring devices added in V areas (-T4 and -T5). LSS/JW Arrester =WT-F1 changed to capacitor =WT-C1. LSS/AH Transformer =WT-T1 redrawn and renamed. HF blocking filters added in area U. LC/LR Rev Ind Revision Appd Year Week Design checked by T. Tulkiewicz / LST Drawing checked by A. Henriksson / LSS Drawn by T. Björk / LSS Note: All disconnectors (Q1x), and earthing switches (Q2x) are motor operated. Single Line Diagram Cross Sound Cable, Shoreham HVDC Light B 332 ABB POWER SYSTEMS AB Iss by Dept LSS Year Week JNL Rev Ind Rev Ind 07 Sheet 1 Cont -

36 Wallingford Plant Towantic Plant Milford Power 387 to Scovill Rock 330 MW To LIPA New Haven Harbor Unit Figure 2 Connecticut Transmission

37 Proposed Southington Plant Meriden Plant Lake Road Plant Proposed Haddam Neck Project 4X HVDC 330 MW To LIPA Cross Sound Cable Project

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39 APPENDIX II Dispatch Summaries

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41 Export Mode Case Set Dispatch Peak Load 75% Load Peak Load NY-NE Transfer Sensitivity Millstone #1 Sensitivity CT 115 kv Generation Dispatches CT Export/ Import Interface Export Import Export Import Import Export Import Export Export Import Export Haddam Neck Dispatched Against NY-NE Interface Transfer Without Project Loadflow Cases With Project Out-of-service Peakexp Csc-peakexp Montville, Midd#4, Meriden, AES Thames Pkex-1 Csc- pkex-1 Midd#4, Milford 0 Pkex-4 Csc- pkex-4 Out-of-service Peakimp Csc-peakimp Out-of-service Pkimp-1 Csc- pkimp-1 Midd#4, Milford, Meriden Pkimp-6 Csc- pkimp-6 Out-of-service Midexp Csc-Midexp Montville, Midd#4, Meriden, AES Thames Mdexp-1 Csc-Mdexp-1 Midd#4, Milford 0 Mdexp-4 Csc-Mdexp-4 Out-of-service Midimp Csc-Midimp Montville, Midd#4, Meriden, AES Thames Mdimp-1 Csc-Mdimp-1 Out-of-service NYNE7PKIMP CSC-NYNE7PKIMP Montville, Miid#4, Meriden, AES Thames NYNE7PKIMP-1 CSC-NYNE7PKIMP-1 Montville, Midd#4, 700 Meriden, AES Thames NYNE7PKEX CSC-NYNE7PKEX Montville, Midd#4, Meriden, AES Thames NYNE7PKEX-1 CSC-NYNE7PKEX-1 Out-of-service NENY7PKIMP CSC-NENY7PKIMP Montville, Miid#4, Meriden, AES Thames NENY7PKIMP-1 CSC-NENY7PKIMP Out-of-service NENY7PKEX CSC-NENY7PKEX Montville, Miid#4, Meriden, AES Thames NENY7PKEX-1 CSC-NENY7PKEX-1 Out-of-service Peakexp-M1 Csc-Peakexp-M1 Montville, Miid#4, Meriden, AES Thames Pkex-1-M1 Csc-Pkex-1-M1 Out-of-service 0 Midexp-M1 Csc-Midexp-M1 Montville, Miid#4, Meriden, AES Thames Mdexp-1-M1 Csc-Mdexp-1-M1 Out-of-service 700 NENY7PKIMP-2 CSC-NENY7PKIMP-2 Midd#4, Montville NENY7PKIMP-3 CSC-NENY7PKIMP-3 Out-of-service NENY7PKIMP-4 CSC-NENY7PKIMP-4 Out-of-service -700 NENY7PKIMP-5 CSC-NENY7PKIMP-5 Out-of-service NENY7PKIMP-6 CSC-NENY7PKIMP-6 Out-of-service -145 NENY7PKEX-2 CSC-NENY7PKEX-2 Midd#4, Montville -544 NENY7PKEX-3 CSC-NENY7PKEX-3 Out-of-service 425 NYNE7PKEX-2 CSC-NYNE7PKEX-2 Midd#4, Meriden 352 NYNE7PKEX-3 CSC-NYNE7PKEX-3 Midd#4, Milford, Meriden -171 Mdexp-6 CSC-Mdexp-6 Project Mode 330 MW Net Export from CT to Long Island

42 Import Mode Case Set Dispatch Peak Load 75% Load Peak Load NY-NE Transfer Sensitivity CT Export/ Import Interface Export Import Export Import Import Export Import Export Haddam Neck Dispatched Against Out-of-service Midd#4, Meriden, AES Thames Out-of-service Midd#4, Meriden, AES Thames NY-NE Interface Transfer Without Project Ipeakexp Ipkex-2 Ipeakimp Ipkimp-2 Loadflow Cases With Project Csc-peakexp Csc- pkex-1 Csci-peakimp Csci- pkimp-2 Out-of-service Montville, Midd#4, 0 Imidexp Csci-Midexp Meriden, AES Thames Imdexp-2 Csci-Mdexp-2 Out-of-service Montville, Midd#4, -165 Imidimp Csc-Midimp Meriden, AES Thames Idimp-1 Csci-Mdimp-1 Out-of-service 290 INYNE7PKIMP CSCI-NYNE7PKIMP Meriden, AES Thames 490 INYNE7PKIMP-2 CSCI-NYNE7PKIMP-2 Midd#4, Meriden, AES Thames INYNE7PKEX CSCI-NYNE7PKEX 700 Montville, Miid#4, Meriden, AES Thames INYNE7PKEX-2 CSC-NYNE7PKEX-2 Out-of-service Montville, Midd#4, -900 NENY7PKIMP CSC-NENY7PKIMP Meriden, AES Thames NENY7PKIMP-2 CSCI-NENY7PKIMP-2 Out-of-service NENY7PKEX CSCI-NENY7PKEX Montville, Midd#4, -700 Meriden, AES Thames NENY7PKEX-1 CSCI-NENY7PKEX-2 Project Mode 330 MW Net Import from Long Island

43 Export Mode: Peak Load Dispatches The following Table II-1 summarizes the base system (no CSC HVdc project) peak load dispatches used in the analysis and Table II-2 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from CT to Long Island. Table II-1 Peak Load Dispatches: No CSC Project Case Names Plant Peakexp Pkex-1 Pkex-4 Peakimp Pkim-1 Pkim-6 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford I. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-2 - Peak Load Dispatches: CSC HVDC 330 MW Net Export to Long Island Case Names Plant CSC- CSC- CSC- CSC- CSC- CSC- Peakexp Pkex-1 Pkex-4 Peakimp Pkim-1 Pkim-6 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford II. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

44 Export Mode: 75% Load Dispatches The following Table II-3 summarizes the base system 75% load dispatches used in the analysis and Table II-4 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from CT to Long Island. Table II-3 75% Load Dispatches: No CSC Project Case Names Plant Midexp Mdex-1 Mdex-4 Midimp Mdim-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford III. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-4-75% Load Dispatches: CSC HVdc 330 MW Net Export to Long Island Case Names Plant CSC- CSC- CSC- CSC- CSC- Midexp Mdex-1 Mdex-4 Midimp Mdim-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford IV. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

45 Export Mode: Sensitivity to Local CT Generation Sensitivity The following Table II-5 summarizes the base system dispatches used in the analysis to test the sensitivity to local generation near the project and Table II-6 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from CT to Long Island. These dispatches review impact of the CSC HVdc project on the system for various outage scenarios of the New Haven Harbor, Middletown #4, Wallingford, English and Towantic plants at peak load. Table II-7 summarizes dispatches at 75% load and with the New Haven Harbor, Middletown #4 and English plants unavailable. Table II-5 Peak Load with Local CT Generation Sensitivity: No CSC Project Case Names NYNE7PKIMP- NYNE7PKIMP- NENY7PKIMP- NENY7PKIMP- NENY7PKEX- NENY7PKEX- NYNE7PKEX- Plant NENY7PKIMP Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford English Units (#7&8) V. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on NYNE7PKEX-3

46 Table II-6 Peak Load with Local CT Generation Sensitivity: CSC HVdc 330 MW Net Export to Long Island Plant Case Names CSC- NYNE7PKIMP- 2 CSC- NYNE7PKIMP- 3 CSC- NENY7PKIMP- 4 CSC- NENY7PKIMP- 5 CSC- NENY7PKIMP- 6 CSC- NENY7PKEX-2 CSC- NENY7PKEX-3 CSC- NYNE7PKEX-2 CSC- NYNE7PKEX-3 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford English Units (#7&8) VI. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-7 Peak Load with Local CT Generation Sensitivity: With and Without CSC Project No Project With Project 330 Mw Export to Long Island Plant Mdexp-6 CSC-Mdexp-6 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington 0 0 Bridgeport Milford Bridgeport Energy Lake Road New Haven 0 0 Towantic Wallingford English Units (#7&8) 0 0 VII. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

47 Export Mode: Sensitivity to New York-New England Transfers The following Tables II-8 summarizes the base system dispatches used in the analysis to test the sensitivity to the New York New England transfers and Table II-9 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from CT to Long Island. Tables II-10 and II-11 summarize dispatches for NE- NY sensitivity. Table II-8 - NY-NE Sensitivity: No CSC Project Case Names Plant NYNE7PKIMP NYNE7PKIMP-1 NYNE7PKEX NYNE7PKEX-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford VIII. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-9 NY-NE Sensitivity: CSC HVDC 330 MW Net Export to Long Island Plant Case Names CSC- NYNE7PKIMP CSC- NYNE7PKIMP-1 CSC- NYNE7PKEX CSC- NYNE7PKEX-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford IX. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

48 Table II-10 NE-NY Sensitivity: No CSC Project Case Names Plant NENY7PKIMP NENY7PKIMP-1 NENY7PKEX NENY7PKEX-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford X. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-11 NE-NY Sensitivity: CSC HVDC 330 MW Net Export to Long Island Plant Case Names CSC- NENY7PKIMP CSC- NENY7PKIMP-1 CSC- NENY7PKEX CSC- NENY7PKEX-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford XI. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

49 Export Mode: Sensitivity to Millstone 1 The following Tables II-12summarizes the base system dispatches used in the analysis to test the sensitivity to the Millstone 1 unit and Table II-13 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from CT to Long Island. Table II-12- Millstone 1 Sensitivity: No CSC Project Case Names Plant PEAKEXP-M1 PKEX-M1 MIDEXP-M1 MDEXP-M1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford XII. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-13 Millstone 1 Sensitivity: CSC HVDC 330 MW Net Export to Long Island Case Names Plant CSC-PEAKE-M1 CSC-PKEX-M1 CSC-MIDEXP-M1 CSC-MDEXP-M1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford XIII. Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

50 Import Mode: Peak Load Dispatches The following Tables II-14 summarizes the base system (no CSC HVdc project) peak load dispatches used in the analysis and Table II-15 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from Long Island to CT. Table II-14- Peak Load Dispatches: No CSC Project Case Names Plant Ipeakexp Ipkex-2 Ipeakimp Ipkimp-2 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

51 Table II-15- Peak Load Dispatches: Cross Sound HVDC 330 MW Net Import From Long Island Case Names Plant CSCI- CSCI- CSCI- Peakexp Pkex-2 Peakimp Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford CSCI- Pkimp-2 Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

52 Import Mode: 75% Load Dispatches The following Tables II-16 summarizes the base system 75% load dispatches used in the analysis and Table II-17summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from Long Island to CT. Table II-16-75% Load Dispatches: No CSC Project Case Names Plant Imidexp Imdexp-2 Imidimp Imdimp-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

53 Table II-17-75% Load Dispatches: Cross Sound HVdc 330 MW Net Import From Long Island Case Names Plant CSCI- CSCI- CSCI- CSCI- Midexp Mdexp-2 Midimp Mdimp-1 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

54 Import Mode: Sensitivity to New York-New England Transfers The following Tables II-18 summarizes the base system dispatches used in the analysis to test the sensitivity to the New York New England transfers and Table II-19 summarizes the corresponding dispatches with the CSC HVdc project in-service with a net 330 MW transfer from Long Island to CT. Tables II-20 and II-21 summarize dispatches for NE- NY sensitivity. Table II-18 - NY-NE Sensitivity: No CSC Project Case Names Plant INYNE7PKIMP INYNE7PKIMP-2 INYNE7PKEX INYNE7PKEX-2 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

55 Table NY-NE Transfer Sensitivity Dispatches: Cross Sound HVdc 330 MW Net Import From Long Island Plant CSCI- NYNE7PKIMP Case Names CSCI- NYNE7PKIMP- 2 CSCI- NYNE7PKEX CSCI- NYNE7PKEX- 2 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on Table II-20- NE-NY Transfer Sensitivity Dispatches: No CSC Project INENY7PKIMP INENY7PKIMP-2 INENY7PKEX INENY7PKEX- 2 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

56 Table II-21 - NE-NY Transfer Sensitivity Dispatches: Cross Sound HVdc 330 MW Net Import From Long Island Plant CSCI- NENY7PKIMP Case Names CSCI- NENY7PKIMP- 2 CSCI- NENY7PKEX CSCI- NENY7PKEX-2 Haddam Neck Millstone Millstone Millstone Montville Montville AES Thames Middletown Meriden AES Southington Bridgeport Milford Bridgeport Energy Lake Road New Haven Towantic Wallingford Interfaces CT Export NY-NE SW Conn Import East West Flow to LI on

57 APPENDIX III Contingency List

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59 LINE NEW ENGLAND Thermal/Voltage Contingency List 115 KV Contingencies DESCRIPTION 1000 Dudley x Montville x Bean Hill 1080 Card x Montville x Tunnel 1100 Barbour Hill x Enfield 1130 Pequonnock x Compo 1191 Frost Bridge x Campville 1206 Haddam x Conn Yankee 1207 Manchester x East Hartford 1222 Hawthorne x Old Town 1261 Haddam x Bokum 1272 Plumtree x Middle River 1280 Montville x Buddington x Mystic 1355 Southington x Hanover x Colony 1385 Norwalk Harbor x Northport 1389 Norwalk x Flax Hill 1416 Compo x Daden 1430 Ash Creek x Sasco Crek 1440 Glenbrook x Waterside 1450 Glenbrook x South End 1460 Branford RR x East Shore 1466 East Meridan x North Wallingford 1470 Norwalk x Peaceable 1508 Branford x Green Hill 1537 Branford x Branford RR 1545 Devon x Trap Falls 1560 Trap Falls x Ansonia x Stevenson 1565 Plumtree x Ridgefield x Peaceable 1570 Devon x Indian Wells x Beacon Falls 1575N Bunker Hill x Baldwin x Towantic 1575S Towantic x Beacon Falls 1580 Devon x South Naugatuck 1585N Bunker Hill x Towantic 1585S Towantic x South Naugatuck 1588 North Wallingford x Colony 1605 Montville x Flanders B x Williams B 1610 Southington x Mix Ave x June St 1618 Rocky River x West Brookfield 1620 Bokum x Middletown 1630N Southington x Wallingford PF 1630S North Haven x Wallingford PF 1637 Weston x Norwalk 1640 Devon x Wallingford PF 1655 Branford x North Haven 1668 Bunker Hill x Freight 1670 Southington x Berlin x Black Rock 1685 Devon x June St 1690 Southington x Devon x Hanover 1704 South Meadow x Southwest Hartford 1710 Devon x Old Town x Pequonnock 1720 Hawthorne x Norwalk 1721 Frost Bridge x Freight 1722 Southwest Hartford x NW. Hartford 1726 North Bloomfield x Farmington 1730 Devon x Weston x Pequonnock 1732 Canton x Carnpville x Franklin Drive 1740 Waterside x Cos Cob 1750 South End x Tomac x Cos Cob 1751 Manchester x N. Bloomfield x NW Hartford 1752 Berlin x Rocky Hill 1756 Bloomfield x Northwest Hartford 1765 Berlin x Westside 1767 Manchester x Hopewell 1769 Berlin x East New Britain 1770 Plumtree x Stony Hill x Bates Rock 1771 Southington x Berlin 1773 South Meadow x Rocky Hill 1775 Manchester x S. Meadow x Riverside 1777 North Bloomfield x Bloomfield 1779 South Meadow x Bloomfield 1780 Devon x Devon NewingtonxFarmington x E.New Britain 1784 N.Bloomfield x NE. Simsbury x Canton 1785 Berlin x Newington 1786 S. Meadow x Riverside x E. Hartford 1788 Franklin Drive x Torrington 1790 Devon x Devon Chippen Hill x Bristol x Southington 1825 Forestville x Bristol 1835 Chippen Hill x Thomaston 1867 Norwalk x Glenbrook x Norwalk Harbor 1870 Mystic x Woodriver 1880 Norwalk x Glenbrook x Norwalk Harbor 1890 GlenbrookxSasco CreekxNorwalk Harbor 1900 Campville x Torrington Terminal 1921 Campville x Thomaston 1975 Haddam x East Meriden 1977 Darien x South End 1990N Frost Bridge x Baldwin x Towantic 1990S Towantic x Stevenson 8100 East Shore x English x Grand Ave 8200 East Shore x Grand Ave 8300 Mill River x Quinnipiac 8301 Grand Ave x Mill River 8400 Grand Ave x Sackett 8404 Sackett x Sackett Ph x Mix 8500 Grand Ave x Water St 8600 Quinnipiac x North Haven 8700 West River x Water St 88003A West River x Elmwest x Grand Ave 8804A Allings x Woodmont x Elmwest 88005A Woodmont x Milvon x Devon Sw 88005B Woodmont x Milvon x Devon Sw 88006A BarnumxBaird x Devon Sw x Congress 88006B BarnumxBaird x Devon Sw x Congress 8809A PequonnockxCongress xe.main xbaird 89003B West River x Elmwest x Grand Ave 8904B Allings x Woodmont x Elmwest 8909B PequonnockxCongressx E.Main x Baird Pequonnock x Ash Creek x Resco 9500 Water St x Broadway 9502 Broadway x Mill River DEVON_BUSTIE Devon Bus Tie CSC HVDC Cross Sound HVdc

60 Double Circuit 115 kv Contingencies LINE DESCRIPTION Dudley x Montville x Bean Hill - Stockhouse x Montville Card x Montville x Tunnel - Card x Stockhouse x Montville Card x Montville x Tunnel - Montville x Buddington x Mystic Card x Montville x Tunnel - Card x Stockhouse Montville Card x Stockhouse x Montville Barbour Hill x Enfield - Barbour Hill x Windsor Locks Barbour Hill x Enfield - Enfieldi x Windsor Looks Frost BridgexNoeraxToddxSouthington - Frost BridgexNoeraxCanalxSouthington Manchester x South Meadow x Riverside - Manchester x East Hartford Devon x Pequonnock x Weston - Old Town x Hawthorne Frost Bridge x Carmel Hill - Carmel Hill x Rocky River Bokum x Haddam - Bokum x Montville Frost Bridge x Shaws x Bunker Hill Frost Bridge x Shaws x Bunker Hill - Frost Bridge x Freight Montville x Buddington x Mystic - Mystic Woodriver Manchester x South Windsor - Manchester x Barbour Hill Southington x Hanover x Colony - Southington x June Norwalk x Flax Hill - Norwalk x Glenbrook x Norwalk Harbor Scitico x Franconia - Scitico x Ludlow Glenbrook x Waterside - Glenbrook x South End Middletown x Portland x Hopewell Frost Bridge x Shaws x Bunker Hill - Frost Bridge x Freight Norwalk x Peaceable x Rdgfield -Ridgfield x Plumtree Norwalk x Peaceable x Rdgfield - Norwalk x Weston Norwalk x Peaceable x Rdgfield - Norwalk x Hawthorne Tracy x Brooklyn x Fry Brook x Tunnel - Tracy x Fry Brook x Tunnel Devon x Trap Falls - Devon x Indian Well x Beacon all Frost Bridge x Noera x Canal x Southington Trap Falls x Ansonia x Stevenson - Devon x Indian Well x Beacon Fall Devon x Indian Well x Beacon Fall - Beacon Fall x Towantic x Baldwin x Bunker Hill B Devon x Indian Well x Beacon Fall - Beacon Fall x Towantic Devon x Indian Well x Beacon Fall - Devon x South Naugatuck Conn Yak x P&W x Middletown 1575N-1585N Bunker Hill x Baldwin x Towantic - Bunker Hill x Towantic 1575S-1585S South Naugatuck x Devon - South Naugatuck x Towantic Devon x South Naugatuck - South Naugatuck x Towantic Devon x South Naugatuck - Devon x Pequonnock x Weston Bokum x Middletown - Haddam x East Meriden 1630N-1640 Wallingford x Southington - Wallingford x Devon 1630S-1640 Wallingford x North Haven - Wallingford x Devon Norwalk x Weston - Norwalk x Hawthorne Wallingford x Devon - Southington x Hanover x Devon Shepaug x Bates Rock - Shepaug x Stony Hill x West Brookfield Freight x Bunker Hill - Freight x Southington Southington x Berlin x Black Rock - Southington x Berlin Southington x Berlin x Black Rock - Southington x Black Rock Devon x Pequonnock x Old Town - Devon x Pequonnock x Weston Norwalk x Hawthorne - Devon x Pequonnock x Weston Canton x Campville x Franklin Drive - Franklin Drive x Torrington Terminal N. Bloomfield x Bloomfield - N. Bloomfield x NW Hartford x Manchester Plumtree x Stony Hill x Bates Rock - Shepaug x Stony Hill x West Brookfield Southington x Berlin - Southington x Black Rock N. Bloomfield x Bloomfield - Bloomfield x South Meadow Southington x Forestville x UT - Southington x Bristol x Chippen Hill Southington x Forestville x UT - Forrestville x Bristol Southington x Bristol x Chippen Hill - Forrestville x Bristol Glenbrook x Flax Hill x Norwalk Harbor - Glenbrook x Norwalk x Norwalk Harbor Glenbrook x Flax Hill x Norwalk Harbor - Darien South End Stevenson x Sandy Hook x Newington x Plum Tree Glenbrook x Norwalk x Norwalk Harbor - Glenbrook x Sasco Cr x Norwalk Harbor Southiington x Todd x Noera x Frost Bridge Frost BridgexNoeraxToddxSouthington - Frost BddgexNoeraxCanalxSouthington 1990N-1990S Frost Bridge x Baldwin x Towantic - Towantic x Stevenson East Shore x English x Grand Ave - East Shore x Grand Ave

61 345 KV Contingencies LINE DESCRIPTION 310 Millstone x Manchester 321 Long Mountain x Plurntree 329E Frost Bridge x AES Southington 329W AES Southington x Southington 329WE Frost Bridge x AES Southington AES Southington x Southington 330 Card x Lake Road 347 Lake Road x Sherman Road 347+SP Lake Road x Sherman Road SPS 347S Card Lake x Lake Road 347S+SP Card Lake x Lake Road SPS 348 Millstone x Southington&Auto 352 Long Mountain x Frost Bridge&Auto 353 Scovill Rock x Manchester&Auto 354 Ludlow x Northfield Mtn 362E Haddam Neck x Meriden Pwr 362W Meriden Pwr x Southington 362WE Haddam Neck x Meriden Pwr - Meriden Pwr x Southington 364 Haddam Neck x Montville&Auto 368 Card x Manchester 371 Millstone x Montville&Auto 376 Haddam Neck x Scovill Rock 381 Northfield Mountain x Vermont Yankee 383 Millstone x Card 384 Scovill Rock x Middletown 387 Scovill Rock x East Shore& Auto 387H Scovill Rock x CSC HVDC x East Shore& Auto 387LEO 387 Line End Open at Scovill Rock 387LEO+RB 387 Line End Open at Scovill Rock with HVDC Runback 387S CSC HVDC x East Shore& Auto 395 Ludlow x Manchester x N. Bloomfield 398 Long Mountain x Pleasant Valley SOUTHAUTO1 Southington Auto-1 SOUTHAUTO2 Southington Auto-2 Double Circuit 345 kv Contingencies LINE DESCRIPTION Ludlow x Carpenter Hill - Carpenter Hill x Millbury Millstone x Manchester - Millstone x Southington Millstone x Manchester - Millstone x Card Millstone x Manchester - Card x Manchester Northfield Mountain x Berkshire wauto x Alps Long Mountain x Plumtree - Shepaug x Stony Hill x West Brookfield Scovill Rock x Manchester - Middletown x Portland x Hopewell Scovill Rock x Manchester - Manchester x Hopewell Scovill Rock x East Shore - Branford RR x East Shore 387H-1460 Scovill Rock x CSC HVDC x East Shore - Branford RR x East Shore Long Mountain x Plumtree - Rocky River x West Brookfield Long Mountain x Plumtree - Plumtree x Stony Hill x Bates Rock Long Mountain x Plumtree - Shepaug x Stony Hill x West Brookfield Millstone x Southington - Haddam x East Meriden Meriden Pwr x Southington -Haddam x East Meriden - Haddam Neck x Meriden Pwr Ludlow x Manchester x N. Bimfield - Manchester x N.Bimfield x NW Hartford Ludlow x Manchester x North Bloomfield - South Meadow x Bloomfield 329W-352 Frost Bridge x AES Sgton - AES Sgton x Soutingtn - Long Mtn x Frost Bddge&Auto Card x Lake Road - Lake Road x Sherman Road Millstone x Southington - Scovill Rock x East Shore H Millstone x Southington - Scovill Rock x CSC HVDC x East Shore Millstone x Card - Millstone x Montville 362E-376 Haddam Neck x Meriden Pwr - Haddam Neck x Scovill Rock

62 345 kv Stuck Breaker Contingencies LINE DESCRIPTION. NRTFD_STK_3T NorthField Mountain 3T Stuck Breaker, Berkshire Auto & 312, 393, 381 OOS MTVILLE_STK Montville 345 kv IT Stuck Breaker SCVRK_4T_STK Scovill Rock345 kv 4T Stuck Breaker SCVRK_5T_STK Scovill Rock345 kv 5T Stuck Breaker SCVRK_7T_STK Scovill Rock345 kv 7T Stuck Breaker SCVRK_8T_STK Scovill Rock345 kv 8T Stuck Breaker SOUTN_4T_STA Southington 4T Stuck Breaker, 329 & 362 OOS SOUTN_4T_STB Southington 4T Stuck Breaker, 329E & 362 OOS SOUTN_4T_STC Southington 4T Stuck Breaker, 329 & 362W OOS SOUTN_4T_STD Southington 4T Stuck Breaker, 329E & 362W OOS SOUTN_5T_STA Southington 5T Stuck Breaker 329 SOUTN_5T_STB Southington 5T Stuck Breaker, 329E SOUTN_7T_STK Southington 7T Stuck Breaker LMTN_6T-8T Long Mountain Stuck Breaker LUDLOW_STK3T Ludlow 3T Stuck Breaker, Ludlow Auto & Lines 301, 395 OOS MANCSTER21T Manchester 21T Stuck Breaker CARD_ST_STK Any Stuck Breaker Takes out Lines 330 & 383 HADDAM_STK1T Haddam Neck 1T Stuck Breaker HADDAM_STK2T Haddam Neck 2T Stuck Breaker HADDAM_STK3T Haddam Neck 3T Stuck Breaker HADDAM_STK4T Haddam Neck 4T Stuck Breaker Loss of Generation Contingencies LINE DESCRIPTION NRTHFD12 Northfield 1 & 2 NH-HARBOR New Haven Harbor MIDDTN#4 Middletown 4 MILL#1 Millstone Unit 1 MILL#2 Millstone Unit 2 MILL#3 Millstone Unit 3 MONTV#6 Montville 6 NORHAR#2 Norwalk Harbor 2 BPTHBR#3 Bridgeport 3

63 APPENDIX IV Project Data

64

65 HVdc Loadflow Data New Haven (CT) DATA FOR BUS 3665 [NHHHVDCL 192] RESIDING IN AREA 1, ZONE 185, OWNER 1: CODE PLOAD QLOAD I - L O A D Y - L O A D G-SHUNT B-SHUNT VOLTAGE ANGLE MOD VHI VLO SHUNT* X X X X X X X X X---- REMOTE ----X : : PLNT PGEN QGEN QMAX QMIN VSCHED X- REMOTE BUS VOLTAGE Q PCT-X [CSC-HVDC 345] ID ST PGEN QGEN QMAX QMIN MBASE Z S O R C E X T R A N GENTAP PMAX PMIN OW1 FRAC1 OW2 FRAC2 OW3 FRAC3 OW4 FRAC W M S C C C X TO X CKT X-NAME-X 1 T T Z W M R 1-2 X 1-2 WBASE1 MAG1 MAG2 RATE-A RATE-B RATE-C OWN1 FRAC1 OWN2 FRAC2 OWN3 FRAC3 OWN4 FRAC CSC-HVDC F F X TO X CKT WINDV1 NOMV1 ANGLE WINDV2 NOMV2 CN RMAX RMIN VMAX VMIN NTPS X- -CONTROLLED BUS-X CR CX TBL NOMINAL R,X 3664 CSC-HVDC NHHHVDCL 192 Shoreham (NY) DATA FOR BUS 5073 [SHMHVDCL 192] RESIDING IN AREA 2, ZONE 245, OWNER 1: CODE PLOAD QLOAD I - L O A D Y - L O A D G-SHUNT B-SHUNT VOLTAGE ANGLE MOD VHI VLO SHUNT* X X X X X X X X X---- REMOTE ----X : : PLNT PGEN QGEN QMAX QMIN VSCHED X- REMOTE BUS VOLTAGE Q PCT-X [SHOREHAM 138] ID ST PGEN QGEN QMAX QMIN MBASE Z S O R C E X T R A N GENTAP PMAX PMIN OW1 FRAC1 OW2 FRAC2 OW3 FRAC3 OW4 FRAC W M S C C C X TO X CKT X-NAME-X 1 T T Z W M R 1-2 X 1-2 WBASE1 MAG1 MAG2 RATE-A RATE-B RATE-C OWN1 FRAC1 OWN2 FRAC2 OWN3 FRAC3 OWN4 FRAC SHOREHAM T F X TO X CKT WINDV1 NOMV1 ANGLE WINDV2 NOMV2 CN RMAX RMIN VMAX VMIN NTPS X- -CONTROLLED BUS-X CR CX TBL NOMINAL R,X 5062 SHOREHAM SHMHVDCL 192 * Note initial design was 105 MVar. Current design is 103 MVar comprised of one 61 MVar, one 32 MVar and one 10 MVar bank. Net reactive capability to the system remains the same.

66

67 APPENDIX V EXPORT MODE: 330 MW Transfer from CT to Long Island Thermal Results

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69 Appendix Va Subordinate Studies Mode: 330 MW Net Export to Long Island Appendix V Comparison of Thermal VIiolations CT Loadflow Cases Table No. Dispatch Export/Import Interface Without Project With Project Va-1 Peakexp Csc-peakexp Va-2 Export Pkex-1 Csc- pkex-1 Va-3 Pkex-4 Csc- pkex-4 Peak Load Va-4 Peakimp Csc-peakimp Va-5 Import Pkimp-1 Csc- pkimp-1 Va-6 Pkimp-6 Csc- pkimp-6 Vb-1 Midexp Csc-Midexp Vb-2 Export Mdexp-1 Csc-Mdexp-1 Vb-3 75% Load Mdexp-4 Csc-Mdexp-4 Vb-4 Midimp Csc-Midimp Import Vb-5 Mdimp-1 Csc-Mdimp-1 Vc-1 NENY7PKIMP-2 CSC-NENY7PKIMP-2 Vc-2 NENY7PKIMP-3 CSC-NENY7PKIMP-3 Vc-3 Import NENY7PKIMP-4 CSC-NENY7PKIMP-4 Vc-4 NENY7PKIMP-5 CSC-NENY7PKIMP-5 Ct 115 kv Vc-5 NENY7PKIMP-6 CSC-NENY7PKIMP-6 Generation Vc-6 NENY7PKEX-2 CSC-NENY7PKEX-2 Dispatches Vc-7 NENY7PKEX-3 CSC-NENY7PKEX-3 Vc-8 Export NYNE7PKEX-2 CSC-NYNE7PKEX-2 Vc-9 NYNE7PKEX-3 CSC-NYNE7PKEX-3 Vc-10 Mdexp-6 CSC-Mdexp-6 Vd-1 NYNE7PKIMP CSC-NYNE7PKIMP Import Vd-2 NYNE7PKIMP-1 CSC-NYNE7PKIMP-1 Vd-3 NYNE7PKEX CSC-NYNE7PKEX Peak Load Export Vd-4 NYNE7PKEX-1 CSC-NYNE7PKEX-1 NY-NE Transfer Vd-5 NENY7PKIMP CSC-NENY7PKIMP Sensitivity Import Vd-6 NENY7PKIMP-1 CSC-NENY7PKIMP-1 Vd-7 NENY7PKEX CSC-NENY7PKEX Export Vd-8 NENY7PKEX-1 CSC-NENY7PKEX-1 Ve-1 Peakexp-M1 Csc-Peakexp-M1 Ve-2 Millstone #1 Pkex-1-M1 Csc-Pkex-1-M1 Export Ve-3 Sensitivity Midexp-M1 Csc-Midexp-M1 Ve-4 Mdexp-1-M1 Csc-Mdexp-1-M1 Project Mode 330 MW Net Export from CT to Long Island

70 Appendix Va Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island Peak Load Dispatches: Thermal Loading Comparison TABLE Va-1: Compare: peakexp.out with: csc-peakexp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *SOUTHGTN RES RD J CCT1771& TABLE Va-2: Compare: pkex-1.out with: csc-pkex-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *SOUTHGTN RES RD J CCT1771& CRRA JCT *ASHCREEK CCT1710& <99.0 TABLE Va-3: Compare: pkex-4.out with: csc-pkex-4.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *SGTN B TODD LINE-329W < *SGTN B CANAL LINE-329W < *SOUTHGTN RES RD J CCT1771& TABLE Va-4: Compare: peakimp.out with: csc-peakimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE-362W < SPS/LINE UPGRADE *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710&

71 Appendix Va Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Va-5: Compare: pkimp-1.out with: csc-pkimp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE-362E < SPS/LINE UPGRADE *CANTON WEINGART LINE-362W < SPS/LINE UPGRADE *CANTON WEINGART LINE-362WE < SPS/LINE UPGRADE *CANTON WEINGART LMTN_6T-8T < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& SPS/LINE UPGRADE TABLE Va-6: Compare: pkimp-6.out with: csc-pkimp-6.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE329W < SPS/LINE UPGRADE *CANTON WEINGART LINE-362E < SPS/LINE UPGRADE *CANTON WEINGART LINE-362W < SPS/LINE UPGRADE *CANTON WEINGART LINE-362WE < SPS/LINE UPGRADE *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE *CANTON WEINGART LINE < SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK2T < SPS/LINE UPGRADE *CANTON WEINGART LINE362A& < SPS/LINE UPGRADE *CANTON WEINGART LINE348&387A < SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& N.BLMFLD *BLOOMFLD CCT1207&

72 Appendix Vb Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island 75% Load Dispatches: Thermal Loading Comparison TABLE Vb-1: Compare: midexp.out with: csc-midexp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE <99.0 TABLE Vb-2: Compare: mdexp-1.out with: csc-mdexp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE <99.0 TABLE Vb-3: Compare: mdexp-4.out with: csc-mdexp-4.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CTRI WOOD RV LINE < SPS *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE < *CTRI WOOD RV LINE330& < SPS

73 Appendix Vb Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vb-4: Compare: midimp.out with: csc-midimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP N.BLMFLD *SOUTHWCK LINE *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STC < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T N.BLMFLD *SOUTHWCK LUDLOW_STK3T *CANTON WEINGART LINE348&387A < SPS/LINE UPGRADE *N.BLMFLD BLOOMFLD CCT_395& N.BLMFLD *SOUTHWCK CCT_395& N.BLMFLD *SOUTHWCK CCT_395& COMPO *S.NORWAK CCT1440& < *COMPO PEQUONIC CCT1440& < *TOMAC SO.END CCT1440& < *DARIEN S.NORWAK CCT1440& < N.BLMFLD *SOUTHWCK CCT *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE TABLE Vb-5: Compare: mdimp-1.out with: csc-mdimp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP N.BLMFLD *SOUTHWCK LINE *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STD < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T N.BLMFLD *SOUTHWCK LUDLOW_STK3T *CANTON WEINGART LINE348&387A < SPS/LINE UPGRADE *N.BLMFLD BLOOMFLD CCT_395& N.BLMFLD *SOUTHWCK CCT_395& N.BLMFLD *SOUTHWCK CCT_395& COMPO *S.NORWAK CCT1440& < *COMPO PEQUONIC CCT1440& < *TOMAC SO.END CCT1440& < *DARIEN S.NORWAK CCT1440& < N.BLMFLD *SOUTHWCK CCT *CANTON WEINGART LINE348&387H < SPS/LINE UPGRAD

74 Appendix Vc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island CT 115 kv Generation Dispatches: Thermal Loading Comparison TABLE Vc-1: Compare: nyne7pkimp-2.out with: csc-nyne7pkimp-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 *BUNKER H TOW LINE-1990N N 3185 *BUNKER H TOW LINE-1990N&S N 3185 *BUNKER H TOW CCT < N 3185 *BUNKER H TOW CT1570&1575A < SACKPHS *MIX AVE LINE-387LEO < LEO Runback SPS 88005A 3688 *MILVON A DEVON LINE-387LEO < LEO Runback SPS 89005B 3689 *MILVON B DEVON LINE-387LEO < LEO Runback SPS SACKPHS *MIX AVE SCVRK_7T_STK < Modified Runback SPS 88005A 3688 *MILVON A DEVON SCVRK_7T_STK < Modified Runback SPS TABLE Vc-2: Compare: nyne7pkimp-3.out with: csc-nyne7pkimp-3.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 BUNKER H *TOW LINE-1990N N 3185 BUNKER H *TOW LINE-1990N&S WAWECS J *CARD MTVILLE_STK N 3185 *BUNKER H TOW CCT < N 3185 *BUNKER H TOW CT1570&1575A < SACKPHS *MIX AVE LINE-387LEO < LEO Runback SPS 88005A 3688 *MILVON A DEVON LINE-387LEO < LEO Runback SPS 89005B 3689 *MILVON B DEVON LINE-387LEO < LEO Runback SPS SACKPHS *MIX AVE SCVRK_7T_STK < Modified Runback SPS 88005A 3688 *MILVON A DEVON SCVRK_7T_STK < Modified Runback SPS 89005B 3689 *MILVON B DEVON SCVRK_7T_STK < Modified Runback SPS

75 Appendix Vc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vc-3: Compare: nyne7pkex-2.out with: csc-nyne7pkex-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 BUNKER H *TOW LINE-1990N N 3185 BUNKER H *TOW LINE-1990N&S *CTRI WOOD RV LINE CANTON *WEINGART MANCSTER21T < N 3185 *BUNKER H TOW CCT N 3185 *BUNKER H TOW CT1570&1575A N 3164 BALDWNJA *TOW N&1585N < *SOUTHGTN RES RD J CCT1771& *RES RD J BERLIN CCT1771& *SOUTHGTN BERLIN CCT1670& CANTON *WEINGART CCT_395& *SOUTHGTN BERLIN LINE BERLIN *NEWINGTN LINE *SOUTHGTN RES RD J LINE *RES RD J BERLIN LINE *CTRI WOOD RV LINE330& *SOUTHGTN RES RD J LINE-310& *CTRI WOOD RV LINE < > SPS *CTRI WOOD RV LINE330& < > SPS TABLE Vc-4: Compare: nyne7pkex-3.out with: csc-nyne7pkex-3.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 BUNKER H *TOW LINE-1990N N 3185 BUNKER H *TOW LINE-1990N&S *CTRI WOOD RV LINE > SPS WAWECS J *CARD MTVILLE_STK < N 3185 *BUNKER H TOW CCT N 3185 *BUNKER H TOW CT1570&1575A N 3164 BALDWNJA *TOW N&1585N *SOUTHGTN RES RD J CCT1771& *RES RD J BERLIN CCT1771& *SOUTHGTN BERLIN CCT1670& CANTON *WEINGART CCT_395& *SOUTHGTN BERLIN LINE BERLIN *NEWINGTN LINE *SOUTHGTN RES RD J LINE *RES RD J BERLIN LINE *CTRI WOOD RV LINE330& > SPS *SOUTHGTN RES RD J LINE-310& < *MYSTICCT WHIP JCT LINE < > SPS *MYSTICCT WHIP JCT LINE330& < > SPS

76 Appendix Vc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vc-5: Compare: neny7pkimp-4.out with: csc-neny7pkimp-4.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE-347S MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP N.BLMFLD *SOUTHWCK LINE WAWECS J *CARD CARD_ST_STK N.BLMFLD *SOUTHWCK MANCSTER21T CRRA JCT *ASHCREEK CCT1710& N.BLMFLD *BLOOMFLD CCT1207& NU wavetrap replacement *N.BLMFLD BLOOMFLD CCT_395& NU wavetrap replacement N.BLMFLD *SOUTHWCK CCT_395& MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE330& N.BLMFLD *SOUTHWCK CCT SACKPHS *MIX AVE LINE-387LEO < LEO Runback SPS *SACKETT SACKPHS SCVRK_7T_STK < Modified Runback SPS SACKPHS *MIX AVE SCVRK_7T_STK < Modified Runback SPS TABLE Vc-6: Compare: neny7pkimp-5.out with: csc-neny7pkimp-5.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE-347S MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP N.BLMFLD *SOUTHWCK LINE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T NWLK HAR *ELYAVE CCT1710& < *SASCO CR ASHCREEK CCT1710& < CRRA JCT *ASHCREEK CCT1710& N.BLMFLD *BLOOMFLD CCT1207& NU wavetrap replacement *N.BLMFLD BLOOMFLD CCT_395& NU wavetrap replacement N.BLMFLD *SOUTHWCK CCT_395& MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE330& N.BLMFLD *SOUTHWCK CCT

77 Appendix Vc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vc-7: Compare: neny7pkimp-6.out with: csc-neny7pkimp-6.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE-347S MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP *CANTON WEINGART LINE-362W SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK LINE *CANTON WEINGART LMTN_6T-8T < SPS/LINE UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STA < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB < SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/LINE UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T N.BLMFLD *S0.AGA-R MANCSTER21T < N.BLMFLD *SO.AGB-R MANCSTER21T < *CANTON WEINGART LINE348&387A SPS/LINE UPGRADE *CANTON WEINGART LINE348&387H SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& N.BLMFLD *BLOOMFLD CCT1207& NU wavetrap replacement *N.BLMFLD BLOOMFLD CCT_395& NU wavetrap replacement N.BLMFLD *SOUTHWCK CCT_395& MEEKVL J *LUDLOW LINE MEEKVL J *LUDLOW LINE330& N.BLMFLD *SOUTHWCK CCT *GLEN JCT MIX AVE LINE-387LEO < LEO RUNBACK SPS *SACKETT SACKPHS LINE-387LEO < LEO RUNBACK SPS SACKPHS *MIX AVE LINE-387LEO < LEO RUNBACK SPS 88005A 3688 *MILVON A DEVON LINE-387LEO < LEO RUNBACK SPS 89005B 3689 *MILVON B DEVON LINE-387LEO < LEO RUNBACK SPS *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE TABLE Vc-8: Compare: neny7pkex-2.out with: csc-neny7pkex-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 *BUNKER H TOW LINE-1990N&S *SOUTHGTN RES RD J CCT1771& *SACKETT SACKPHS SCVRK_7T_STK < Modified Runback SPS SACKPHS *MIX AVE SCVRK_7T_STK < Modified Runback SPS

78 Appendix Vc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vc-9: Compare: neny7pkex-3.out with: csc-neny7pkex-3.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 *BUNKER H TOW LINE-1990N&S *NORHR NWLK HAR LINE *NORHR NRTHPT P LINE *NORHR NRTHPT P LMTN_6T-8T < WAWECS J *CARD MTVILLE_STK < *SOUTHGTN RES RD J CCT1771& < SACKPHS *MIX AVE LINE-387LEO < LEO RUNBACK SPS *SACKETT SACKPHS SCVRK_7T_STK < Modified RUNBACK SPS SACKPHS *MIX AVE SCVRK_7T_STK < Modified RUNBACK SPS TABLE Vc-10: Compare: mdexp-6.out with: csc-mdexp-6.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By 1585N 3185 *BUNKER H TOW LINE-1575N N 3185 BUNKER H *TOW LINE-1990N N 3185 BUNKER H *TOW LINE-1990N&S *BALDWNJB TOW LINE-1990N&S < *NORHR NWLK HAR LINE *NORHR NRTHPT P LINE *NORHR NWLK HAR LMTN_6T-8T *NORHR NRTHPT P LMTN_6T-8T N 3164 BALDWNJA *TOW CCT1271& < N 3164 BALDWNJA *TOW CCT1445& < N 3185 *BUNKER H TOW CCT N 3185 *BUNKER H TOW CT1570&1575A N 3164 *BALDWNJA FROST BR N&1585N N 3164 BALDWNJA *TOW N&1585N N 3164 BALDWNJA *TOW CCT1272& <99.0

79 Appendix Vd Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island NY-NE Transfer Sensitivity: Thermal Loading Comparison TABLE Vd-1: Compare: nyne7pkex.out with: csc-nyne7pkex.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *MYSTICCT WHIP JCT LINE < *CTRI WOOD RV LINE < SPS *SOUTHGTN RES RD J CCT1771& *SOUTHGTN BERLIN CCT1670& *SOUTHGTN BERLIN LINE < BERLIN *NEWINGTN LINE < *SOUTHGTN RES RD J LINE *MYSTICCT WHIP JCT LINE330& < *CTRI WOOD RV LINE330& < SPS TABLE Vd-2: Compare: nyne7pkex-1.out with: csc-nyne7pkex-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *MYSTICCT WHIP JCT LINE *CTRI WOOD RV LINE SPS *SOUTHGTN RES RD J CCT1771& *SOUTHGTN BERLIN CCT1670& < BERLIN *NEWINGTN LINE < *SOUTHGTN RES RD J LINE *MYSTICCT WHIP JCT LINE330& *CTRI WOOD RV LINE330& SPS TABLE Vd-3: Compare: nyne7pkimp.out with: csc-nyne7pkimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& < TABLE Vd-4: Compare: nyne7pkimp-1.out with: csc-nyne7pkimp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of

80 Appendix Vd Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T < SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& < NE-NY Transfer Sensitivity: Thermal Loading Comparison TABLE Vd-5: Compare: neny7pkex.out with: csc-neny7pkex.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE < SPS *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE *SGTN B TODD LINE-329W < SGTN B *CANAL LINE-329W < NOERA JA *CANAL LINE-329W < *TODD NOERA JB LINE-329W < CRRA JCT *ASHCREEK CCT1710& <99.0 TABLE Vd-6: Compare: neny7pkex-1.out with: csc-neny7pkex-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE < SPS *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE *SGTN B TODD LINE-329W < SGTN B *CANAL LINE-329W < NOERA JA *CANAL LINE-329W < CRRA JCT *ASHCREEK CCT1710& <99.0

81 Appendix Vd Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vd-7: Compare: neny7pkimp.out with: csc-neny7pkimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP *CANTON WEINGART LINE *CANTON WEINGART LINE329W SPS/LINE UPGRADE *CANTON WEINGART LINE-362E SPS/LINE UPGRADE *CANTON WEINGART LINE-362W SPS/LINE UPGRADE *CANTON WEINGART LINE-362WE SPS/LINE UPGRADE *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_7T_STK < SPS/LINE UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T < *CANTON WEINGART LINE-329WE *CANTON WEINGART LINE-329W SPS/LINE UPGRADE *CANTON WEINGART LINE-329E SPS/LINE UPGRADE *CANTON WEINGART LINE SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK1T SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK2T SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK3T SPS/LINE UPGRADE *CANTON WEINGART LINE362A& SPS/LINE UPGRADE *CANTON WEINGART LINE348&387A SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& *CANTON WEINGART CCT_362& < SPS/LINE UPGRADE N.BLMFLD *BLOOMFLD CCT1207& *CANTON WEINGART CCT1751& < SPS/LINE UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE *CANTON WEINGART LINE348&387H < SPS/LINE UPGRADE

82 Appendix Vd Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island TABLE Vd-8: Compare: neny7pkimp-1.out with: csc-neny7pkimp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE < SPS/LINE UPGRADE MEEKVL J *LUDLOW LINE-347+SP MEEKVL J *LUDLOW LIN-347S+SP *CANTON WEINGART LINE SPS/LINE UPGRADE *CANTON WEINGART LINE329W SPS/LINE UPGRADE *CANTON WEINGART LINE-362E SPS/LINE UPGRADE *CANTON WEINGART LINE-362W SPS/LINE UPGRADE *CANTON WEINGART LINE-362WE SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK LINE < *CANTON WEINGART LMTN_6T-8T SPS/LINE UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/LINE UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/LINE UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/LINE UPGRADE *CANTON WEINGART SOUTN_7T_STK SPS/LINE UPGRADE *CANTON WEINGART SCVRK_7T_STK < SPS/LINE UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T < *CANTON WEINGART NRTFD_STK_3T < SPS/LINE UPGRADE *CANTON WEINGART LINE-329WE SPS/LINE UPGRADE *CANTON WEINGART LINE-329W SPS/LINE UPGRADE *CANTON WEINGART LINE-329E SPS/LINE UPGRADE *CANTON WEINGART LINE SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK2T SPS/LINE UPGRADE *CANTON WEINGART HADDAM_STK3T < SPS/LINE UPGRADE *CANTON WEINGART LINE-310& < SPS/LINE UPGRADE *CANTON WEINGART LINE362A& SPS/LINE UPGRADE *CANTON WEINGART LINE348&387A SPS/LINE UPGRADE *CANTON WEINGART CCT8100& < SPS/LINE UPGRADE CRRA JCT *ASHCREEK CCT1710& *CANTON WEINGART CCT_362& < SPS/LINE UPGRADE N.BLMFLD *BLOOMFLD CCT1207& NU wavetrap replacement *CANTON WEINGART CCT1751& < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK CCT_395& < *CANTON WEINGART LINE-310& < SPS/LINE UPGRADE N.BLMFLD *SOUTHWCK CCT < *CANTON WEINGART LINE348&387H < SPS/LINE UPGRADE

83 Appendix Ve Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Export to Long Island Millstone 1 Sensitivity: Thermal Loading Comparison TABLE Ve-1: Compare: pkex-1-m1.out with: csc-pkex-1-m1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By CRRA JCT *ASHCREEK CCT1710& <99.0 TABLE Ve-2: Compare: peakexp-m1.out with: csc-peakexp-m1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By CRRA JCT *ASHCREEK CCT1710& <99.0 TABLE Ve-3: Compare: midexp-m1.out with: csc-midexp-m1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE <99.0 TABLE Ve-4: Compare: mdexp-1-m1.out with: csc-mdexp-1-m1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *NORHR NWLK HAR LINE < *NORHR NRTHPT P LINE <99.0

84

85 APPENDIX VI IMPORT MODE: 330 MW Transfer from Long Island to CT Thermal Results

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87 Appendix VIa Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut Appendix VI Comparison of Thermal VIiolations CT Loadflow Cases Table No. Dispatch Export/Import Interface Without Project With Project VIa-1 Ipeakexp csci-peakexp Export VIa-2 Ipkex-2 csci -pkex-2 Peak Load VIa-3 Ipeakimp csci-peakimp Import VIa-4 Ipkimp-2 csci-pkimp-2 VIb-1 Imidexp csci -midexp Export VIb-2 Imdexp-2 csci-mdexp-2 75% Load VIb-3 Imidimp csci -midimp Import VIb-4 Imdimp-1 csci-mdimp-1 VIc-1 INYNE7PKIMP csci-nyne7pkimp Import VIc-2 INYNE7PKIMP-2 Csci-NYNE7PKIMP-2 VIc-3 INYNE7PKEX csci-nyne7pkex Peak Load Export VIc-4 INYNE7PKEX-2 csci-nyne7pkex-2 NY-NE Transfer VId-1 INENY7PKIMP Csci-NENY7PKIMP Sensitivity Import VId-2 INENY7PKIMP-2 Csci-NENY7PKIMP-2 VId-3 INENY7PKEX csci-neny7pkex Export VId-4 INENY7PKEX-2 csci-neny7pkex-2 Project Mode 330 MW Net Import from Long Island

88 Appendix VIa Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut Cross Sound Dispatched Against New Haven Harbor: Thermal Loading Comparison Peak Load Dispatches TABLE VIa-1: Compare: ipeakexp.out with: csci-peakexp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE SPS *DEVON SO.NAUG CCT1545& *SOUTHGTN RES RD J CCT1771& *SOUTHGTN BERLIN CCT1670& < NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867& BERLIN *NEWINGTN LINE < *SOUTHGTN RES RD J LINE TABLE VIa-2: Compare: ipkex-2.out with: csci-pkex-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE SPS DEVON *SO.NAUG CCT1545& *SOUTHGTN RES RD J CCT1771& NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867& BERLIN *NEWINGTN LINE < *SOUTHGTN RES RD J LINE <99.0 TABLE VIa-3: Compare: ipeakimp.out with: csci-peakimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA < SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB < SPS/UPGRADE

89 Appendix VIa Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut TABLE VIa-4: Compare: ipkimp-2.out with: csci-pkimp-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/UPGRADE

90 Appendix VIb Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut 75% Load Dispatches TABLE VIb-1: Compare: imidexp.out with: csci-midexp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CTRI WOOD RV LINE SPS *CTRI WOOD RV LINE330& SPS TABLE VIb-2: Compare: imdexp-2.out with: csci-mdexp-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By NOTHING TO REPORT

91 Appendix VIb Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut TABLE VIb-3: Compare: imidimp.out with: csci-midimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/UPGRADE *CANTON WEINGART SCVRK_8T_STK < N.BLMFLD *SOUTHWCK LINE < N.BLMFLD *SOUTHWCK MANCSTER21T < N.BLMFLD *SOUTHWCK CCT_395& < N.BLMFLD *SOUTHWCK CCT < TABLE VIb-4: Compare: imdimp-1.out with: csci-mdimp-1.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/UPGRADE N.BLMFLD *SOUTHWCK MANCSTER21T <

92 Appendix VIc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut NY-NE Transfer Sensitivity TABLE VIc-1: Compare: inyne7pkimp.out with: csci-nyne7pkimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By NOTHING TO REPORT TABLE VIc-2: Compare: inyne7pkimp-2.out with: csci-nyne7pkimp-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LMTN_6T-8T < SPS/UPGRADE TABLE VIc-3: Compare: inyne7pkex.out with: csci-nyne7pkex.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE < SPS *MYSTICCT WHIP JCT LINE *CTRI WOOD RV LINE SPS *SOUTHGTN RES RD J CCT1771& *SOUTHGTN BERLIN CCT1670& NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867& *SOUTHGTN BERLIN LINE BERLIN *NEWINGTN LINE *SOUTHGTN RES RD J LINE *RES RD J BERLIN LINE < *MYSTICCT WHIP JCT LINE330& *CTRI WOOD RV LINE330& SPS

93 Appendix VIc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut TABLE VIc-4: Compare: inyne7pkex-2.out with: csci-nyne7pkex-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE SPS *SOUTHGTN RES RD J CCT1771& *SOUTHGTN BERLIN CCT1670& NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867& *SOUTHGTN BERLIN LINE < BERLIN *NEWINGTN LINE *SOUTHGTN RES RD J LINE *MYSTICCT WHIP JCT LINE *CTRI WOOD RV LINE SPS *MYSTICCT WHIP JCT LINE330& *CTRI WOOD RV LINE330& SPS

94 Appendix VIc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut NE-NY Transfer Sensitivity TABLE VId-1: Compare: ineny7pkimp.out with: csci-neny7pkimp.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART LINE329W SPS/UPGRADE *CANTON WEINGART LINE-362E SPS/UPGRADE *CANTON WEINGART LINE-362W SPS/UPGRADE *CANTON WEINGART LINE-362WE SPS/UPGRADE *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE WAWECS J *CARD CARD_ST_STK *CANTON WEINGART SOUTN_4T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_7T_STK SPS/UPGRADE *CANTON WEINGART SCVRK_8T_STK SPS/UPGRADE *CANTON WEINGART NRTFD_STK_3T SPS/UPGRADE *CANTON WEINGART LINE-329WE SPS/UPGRADE *CANTON WEINGART LINE-329W SPS/UPGRADE *CANTON WEINGART LINE-329E SPS/UPGRADE *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART HADDAM_STK1T SPS/UPGRADE *CANTON WEINGART HADDAM_STK2T SPS/UPGRADE *CANTON WEINGART HADDAM_STK3T SPS/UPGRADE *CANTON WEINGART LINE362A& SPS/UPGRADE *CANTON WEINGART LINE348&387A SPS/UPGRADE *CANTON WEINGART LINE < SPS/UPGRADE *CANTON WEINGART LINE348&387H < SPS/UPGRADE *CANTON WEINGART LINE < SPS/UPGRADE

95 Appendix VIc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut TABLE VId-2: Compare: ineny7pkimp-2.out with: csci-neny7pkimp-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART LINE329W SPS/UPGRADE *CANTON WEINGART LINE-362E SPS/UPGRADE *CANTON WEINGART LINE-362W SPS/UPGRADE *CANTON WEINGART LINE-362WE SPS/UPGRADE *CANTON WEINGART LMTN_6T-8T SPS/UPGRADE WAWECS J *CARD CARD_ST_STK SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STC SPS/UPGRADE *CANTON WEINGART SOUTN_4T_STD SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STA SPS/UPGRADE *CANTON WEINGART SOUTN_5T_STB SPS/UPGRADE *CANTON WEINGART SOUTN_7T_STK SPS/UPGRADE *CANTON WEINGART NRTFD_STK_3T SPS/UPGRADE *CANTON WEINGART LINE-329WE SPS/UPGRADE *CANTON WEINGART LINE-329W SPS/UPGRADE *CANTON WEINGART LINE-329E SPS/UPGRADE *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART HADDAM_STK2T SPS/UPGRADE *CANTON WEINGART LINE362A& SPS/UPGRADE *CANTON WEINGART LINE348&387A SPS/UPGRADE *CANTON WEINGART CCT_362& SPS/UPGRADE *CANTON WEINGART LINE SPS/UPGRADE *CANTON WEINGART LINE-387S < SPS/UPGRADE *CANTON WEINGART SCVRK_8T_STK < SPS/UPGRADE *CANTON WEINGART HADDAM_STK3T < SPS/UPGRADE *CANTON WEINGART LINE-310& < SPS/UPGRADE *CANTON WEINGART LINE348&387H < SPS/UPGRADE *CANTON WEINGART CCT8100& < SPS/UPGRADE N.BLMFLD *BLOOMFLD CCT1207& < SPS/UPGRADE *CANTON WEINGART CCT1751& < SPS/UPGRADE *CANTON WEINGART LINE-310& < SPS/UPGRADE TABLE VId-3: Compare: ineny7pkex.out with: csci-neny7pkex.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE SPS *RYTN J A NWLK HAR LINE SGTN B *CANAL LINE-329W DEVON *SO.NAUG CCT1545& *SOUTHGTN RES RD J CCT1771& <99.0

96 Appendix VIc Cross Sound HVdc Phase I Subordinate Studies Mode: 330 MW Net Import to Connecticut NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867& SGTN B *TODD LINE-329W < TABLE VId-4: Compare: ineny7pkex-2.out with: csci-neny7pkex-2.out ACCC OVERLOAD REPORT: MONITORED ELEMENTS LOADED ABOVE 99.0 % OF RATING SET B NO Project WITH Project Overloaded Element % of % of Line Bus Name Bus Name Ct Contingency RATE FLOW LTE FLOW LTE DELTA Comments Alleviated By DRBY J B *IND.WELL LINE SPS *RYTN J A NWLK HAR LINE SGTN B *TODD LINE-329W < SGTN B *CANAL LINE-329W NOERA JA *CANAL LINE-329W < *TODD NOERA JB LINE-329W < DEVON *SO.NAUG CCT1545& NWLK HAR *RYTN J B CCT1880& *RYTN J A NWLK HAR CCT1867&

97 APPENDIX VII Voltage Analysis

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99 Appendix VII Comparison of Voltage VIIolations CT Loadflow Cases Table No. Dispatch Export/Import Interface Without Project With Project VII-1 Peakexp Csc-peakexp VII-2 Export Pkex-1 Csc- pkex-1 VII-3 Pkex-4 Csc- pkex-4 Peak Load VII-4 Peakimp Csc-peakimp VII-5 Import Pkimp-1 Csc- pkimp-1 VII-6 Pkimp-6 Csc- pkimp-6 VII-7 Midexp Csc-Midexp VII-8 Export Mdexp-1 Csc-Mdexp-1 VII-9 75% Load Mdexp-4 Csc-Mdexp-4 VII-10 Midimp Csc-Midimp Import VII-11 Mdimp-1 Csc-Mdimp-1 VII-12 NYNE7PKIMP CSC-NYNE7PKIMP Import VII-13 NYNE7PKIMP-1 CSC-NYNE7PKIMP-1 VII-14 NYNE7PKEX CSC-NYNE7PKEX Peak Load Export VII-15 NYNE7PKEX-1 CSC-NYNE7PKEX-1 NY-NE Transfer VII-16 NENY7PKIMP CSC-NENY7PKIMP Sensitivity Import VII-17 NENY7PKIMP-1 CSC-NENY7PKIMP-1 VII-18 NENY7PKEX CSC-NENY7PKEX Export VII-19 NENY7PKEX-1 CSC-NENY7PKEX-1 VII-20 Peakexp-M1 Csc-Peakexp-M1 VII-21 Millstone #1 Pkex-1-M1 Csc-Pkex-1-M1 Export VII-22 Sensitivity Midexp-M1 Csc-Midexp-M1 VII-23 Mdexp-1-M1 Csc-Mdexp-1-M1 VII-24 NENY7PKIMP-2 CSC-NENY7PKIMP-2 VII-25 NENY7PKIMP-3 CSC-NENY7PKIMP-3 VII-26 Import NENY7PKIMP-4 CSC-NENY7PKIMP-4 VII-27 NENY7PKIMP-5 CSC-NENY7PKIMP-5 Ct 115 kv VII-28 NENY7PKIMP-6 CSC-NENY7PKIMP-6 Generation VII-29 NENY7PKEX-2 CSC-NENY7PKEX-2 Dispatches VII-30 NENY7PKEX-3 CSC-NENY7PKEX-3 VII-31 Export NYNE7PKEX-2 CSC-NYNE7PKEX-2 VII-32 NYNE7PKEX-3 CSC-NYNE7PKEX-3 VII-33 Mdexp-6 CSC-Mdexp-6 VII-34 Ipeakexp csci-peakexp Export VII-35 Ipkex-2 csci -pkex-2 Peak Load VII-36 Ipeakimp csci-peakimp Import VII-37 Ipkimp-2 csci-pkimp-2 VII-38 Imidexp csci -midexp Export VII-39 Imdexp-2 csci-mdexp-2 75% Load VII-40 Imidimp csci -midimp Import VII-41 Imdimp-1 csci-mdimp-1 VII-42 INYNE7PKIMP csci-nyne7pkimp Import VII-43 INYNE7PKIMP-2 Csci-NYNE7PKIMP-2 VII-44 INYNE7PKEX csci-nyne7pkex Peak Load Export VII-45 INYNE7PKEX-2 csci-nyne7pkex-2 NY-NE Transfer VII-46 INENY7PKIMP Csci-NENY7PKIMP Sensitivity Import VII-47 INENY7PKIMP-2 Csci-NENY7PKIMP-2 VII-48 INENY7PKEX csci-neny7pkex Export VII-49 INENY7PKEX-2 csci-neny7pkex-2 Project Mode 330 MW Net Export from CT to Long Island 330 MW Net Import from Long Island

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101 Appendix VII Comparison of Voltage Violations Table VII-1 Case: peakexp Case: csc-peakexp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-2 Case: pkex-1 Without Project Case: csc-pkex-1 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

102 Appendix VII Comparison of Voltage Violations Table VII-3 Case: pkex-4 Case: csc-pkex-4 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE HAWTREAC 115 CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-4 Case: peakimp Without Project Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency Case: csc-peakimp With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE

103 Appendix VII Comparison of Voltage Violations Table VII-5 Case: pkimp-1 Case: csc-pkimp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-6 Case: pkimp-6 Case: csc-pkimp-6 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B ANSONIA 115 CCT1545& BATES RK 115 LINE BATES RK 115 CCT_1770& BULLS BR 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 115 CCT_1770& SHEPAUG 69.0 LINE SHEPAUG 69.0 CCT_1770& STONY HL 115 LINE CANTON 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

104 Appendix VII Comparison of Voltage Violations Table VII-7 Case: midexp Case: csc-midexp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COMPO 115 CCT1440& COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWALK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& STONY HL 115 LINE TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Table VII-8 Case: mdexp-1 Case: csc-mdexp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Table VII-9 Case: mdexp-4 Without Project Case: csc-mdexp-4 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

105 Appendix VII Comparison of Voltage Violations Table VII-10 Case: midimp Case: csc-midimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COMPO 115 CCT1440& COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& STONY HL 115 LINE TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Table VII-11 Case: mdimp-1 Case: csc-mdimp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COMPO 115 CCT1440& COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& STONY HL 115 LINE TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Table VII-12 Case: nyne7pkimp Without Project Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency Case: csc-nyne7pkimp With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770&

106 Appendix VII Comparison of Voltage Violations STONY HL 115 LINE STONY HL 115 CCT_1770& Table VII-13 Case: nyne7pkimp-1 Case: csc-nyne7pkimp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE LIN BATES RK 115 CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE OLD TOWN 115 CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE CCT_1770& Table VII-14 Case: nyne7pkex Case: csc-nyne7pkex Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

107 Appendix VII Comparison of Voltage Violations Table VII-15 Case: nyne7pkex-1 Case: csc-nyne7pkex-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-16 Case: neny7pkimp Case: csc-neny7pkimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

108 Appendix VII Comparison of Voltage Violations Table VII-17 Case: neny7pkimp-1 Case: csc-neny7pkimp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE TRIANGLE 115 CCT_1618& W.BRKFLD 115 LINE Table VII-18 Case: neny7pkex Without Project Case: csc-neny7pkex With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RIVDRHIA 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE STONY HL 115 CCT_1770& W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

109 Appendix VII Comparison of Voltage Violations Table VII-19 Case: neny7pkex-1 Case: csc-neny7pkex-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& PLUMTREE 345 LMTN_6T-8T RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-20 Case: peakexp-m1 Without Project Case: csc-peakexp-m1 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

110 Appendix VII Comparison of Voltage Violations Table VII-21 Case: pkex-1-m1 Case: csc-pkex-1-m1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-22 Case: midexp-m1 Without Project Case: csc-midexp-m1 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SO.END 115 CCT1440& TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Table VII-23 Case: midexp-1-m1 Without Project Case: csc-midexp-1-m1 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SO.END 115 CCT1440& TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

111 Appendix VII Comparison of Voltage Violations Table VII-24 Case: neny7pkimp-2 Case: csc-neny7pkimp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE WALLFRDJ 115 LINE-1630N WALLPF 115 LINE-1630N WLNGF PF 115 LINE-1630N Table VII-25 Case: neny7pkimp-3 Without Project Case: csc-neny7pkimp-3 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE WALLFRDJ 115 LINE-1630N WALLPF 115 LINE-1630N WLNGF PF 115 LINE-1630N Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

112 Appendix VII Comparison of Voltage Violations Table VII-26 Case: neny7pkimp-4 Case: csc-neny7pkimp-4 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& CCT_1770& BULLS BR 115 LINE CANTON 115 LINE COLONY 115 LINE N/A GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& LUCHJB 115 CCT1355& MYSTICCT 115 LINE NOERA 115 LIN LIN OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-27 Case: neny7pkimp-5 Without Project Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency Case: csc-neny7pkimp-5 With Project Name Contingency VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE WALLFRDJ 115 LINE-1630N WALLPF 115 LINE-1630N WLNGF PF 115 LINE-1630N

113 Appendix VII Comparison of Voltage Violations Table VII-28 Case: neny7pkimp-6 Case: csc-neny7pkimp-6 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE WALLFRDJ 115 LINE-1630N WALLPF 115 LINE-1630N WLNGF PF 115 LINE-1630N Table VII-29 Case: neny7pkex-2 Case: csc-neny7pkex-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BLRKHIA 115 CCT1670& BULLS BR 115 LINE CTRI LINE GREEN HL 115 LINE GREEN HL 115 LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RIVDRHIA 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

114 Appendix VII Comparison of Voltage Violations Table VII-30 Case: neny7pkex-3 Case: csc-neny7pkex-3 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE HAWTREAC 115 CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-31 Case: nyne7pkex-2 Without Project Case: csc-nyne7pkex-2 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& CCT_1770& BULLS BR 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RIVDRHIA 115 LINE N/A RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

115 Appendix VII Comparison of Voltage Violations Table VII-32 Case: nyne7pkex-3 Case: csc-nyne7pkex-3 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE BLRKHIA 115 CCT1670& BULLS BR 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-33 Case: mdexp-6 Without Project Case: csc-mdexp-6 With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation TOMAC 115 CCT1440& WATERSDE 115 CCT1440& COS COB 115 CCT1440& SO.END 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& Table VII-34 Case: ipeakexp Case: csci-peakexp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation 1775 TAP 115 LINE ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

116 Appendix VII Comparison of Voltage Violations Table VII-35 Case: ipkex-2 Case: csci-pkex-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE CCT1710& HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RIVDRHIA 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-36 Case: ipeakimp Case: csci-peakimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B ANSONIA 115 CCT1545& BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE CCT1710& OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

117 Appendix VII Comparison of Voltage Violations Table VII-37 Case: ipkimp-2 Case: csci-pkimp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RIVDRHIA 115 LINE N/A RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-38 Case: imidexp Case: csci-midexp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE N/A TOMAC 115 CCT1440& WATERSDE 115 CCT1440& COS COB 115 CCT1440& SO.END 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& Table VII-39 Case: imdexp-2 Case: csci-mdexp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& S.NORWAK 115 CCT1440& SO.END 115 CCT1440& TOMAC 115 CCT1440& WATERSDE 115 CCT1440& Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

118 Appendix VII Comparison of Voltage Violations Table VII-40 Case: i-midimp Case: csci-midimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& STONY HL 115 LINE TOMAC 115 CCT1440& W.BRKFLD 115 LINE N/A WATERSDE 115 CCT1440& Table VII-41 Case: imdimp-1 Case: csci-mdimp-1 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation BATES RK 115 LINE COS COB 115 CCT1440& DARIEN 115 CCT1440& S.NORWAK 115 CCT1440& SHEPAUG 115 LINE SHEPAUG 69.0 LINE SO.END 115 CCT1440& STONY HL 115 LINE TOMAC 115 CCT1440& W.BRKFLD 115 LINE WATERSDE 115 CCT1440& Table VII-42 Case: inyne7pkimp Case: csci-nyne7pkimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

119 Appendix VII Comparison of Voltage Violations Table VII-43 Case: inyne7pkimp-2 Case: csci-nyne7pkimp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE Table VII-44 Case: inyne7pkex Case: csci-nyne7pkex Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation 1775 TAP 115 LINE ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

120 Appendix VII Comparison of Voltage Violations Table VII-45 Case: inyne7pkimp-2 Case: csci-nyne7pkimp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B ANSONIA 115 CCT1545& BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-46 Case: ineny7pkimp Case: csci-neny7pkimp Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE CTRI LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

121 Appendix VII Comparison of Voltage Violations Table VII-47 Case: ineny7pkimp-2 Case: csci-neny7pkimp-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE HAWTREAC 115 CCT1710& MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Table VII-48 Case: ineny7pkex Case: csci-neny7pkex Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE OLD TOWN 115 LINE RDGEFLDB 115 LINE LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency

122 Appendix VII Comparison of Voltage Violations Table VII-49 Case: ineny7pkex-2 Case: csci-neny7pkex-2 Without Project With Project Name Contingency VII-Cont VII-Init VII-Cont VII-Init Deviation ALLINGSA 115 LINE-8804A ALLINGSB 115 LINE-8904B BATES RK 115 LINE LIN CCT_1770& BULLS BR 115 LINE CANTON 115 LINE GREEN HL 115 LINE LINE HAWTHORN 115 LINE HAWTREAC 115 LINE MYSTICCT 115 LINE OLD TOWN 115 LINE CCT1710& RDGEFLDB 115 LINE RIVDRHIA 115 LINE RKRIV PF 115 LINE ROCK RIV 115 LINE SHEPAUG 115 LINE CCT_1770& SHEPAUG 69.0 LINE CCT_1770& STONY HL 115 LINE W.BRKFLD 115 LINE Notes: All voltage violations for 69 kv and above in CT area are summarized. All voltages noted are in p.u. V-Cont=Voltage Postcontingency, V-Init=Initial Voltage Precontingency