Project Screening Results

Project Screening Results

Updated Economic Issues List Issue Id Constraint Name Contingency M-1 Frederick Town AECI - Frederick Town AMMO 161 kv Line Lutesville - St Francois 345kV Line S-2 North East - Charlotte 161 kv Line Iatan Stranger 345 kv Line S-3 Logan - SW Minot 115 kv Line Blaisedell 230/115 kv Transformer S-4 North Platt - Stockville 115 kv Line Gentleman - Red Willow 230 kv Line M-5 Blue Earth - Winnebago 161kV Line Lakefield Junction - Lakefield 345kV Line M-6 Wapello 161/69 kv Transformer T1 Wapello 161/69 kv Transformer T2 S-7 Collins - Stockton 161 kv Line Neosho La Cygne 345kV Line M-9 Prairie 345/230kV Transformer T2 Prairie 345/230kV Transformer T1 M-10 Swartz - Alto 115kV Line Baxter Wilson - Perryville 500 kv Line M-11 Reed - Dumas 115kV Line Sterlington - El Dorado 500kV Line S-12 Essex - Idalia 161 kv Line Essex - New Madrid 345 kv Line M-13 Grimes Mt Zion 138 kv Line Grimes Ponderosa 230 kv Line S-14 South Shreveport Wall Lake 138 kv Line Dolet Hills 345/230 kv Transformer 2

Screening Process SPP performed initial evaluation for projects addressing SPP issues MISO performed initial evaluation for projects addressing MISO issues Projects addressing multiple issues were evaluated by the RTO which has the highest ranked issue being addressed by the project

Screening Criteria Screening Index (SI): One year benefit / (estimated cost in 2024 dollars* Annual fixed charge rate) Screening Index of at least.5 Benefits and cost calculated for 2024 Proposed solution benefits = SPP Benefit + MISO Benefit IS included as a part of SPP Must provide benefit to both SPP and MISO

Updates to Issues List Logan-SW Minot FLO Blaidsdell transformer Logan-SW Minot reconductor North Platt-Stockville FLO Gentlemen-Red Willow Gentlemen-Red Willow rating decrease removed this need Collins-Stockton FLO Neosho-Lacygne Collins-Stockton rating increase significantly lowered needs congestion 5

Updates to Issues List Blue Earth - Winnebago 161 kv constraint This constraint was binding significantly due to incorrect modeling of a Special Protection Scheme (SPS) in PROMOD Congestion reduced significantly Wapello-Ottumwa 161 kv Ckt 2 constraint Rating increase relived congestion on this constraint Congestion shifted to Wapello 161/69 kv Transformer & Jeff Wapello 161 kv 6

SPP s Screening Results

Potential Seams Projects Passing Screening Projects New 28 mile Dolet Hills-Messick 345kv line, new 500/345kV transformer at Messick New 100 mile Elm Creek-Mark Moore 345kV line Replacing 30MVA 161/69kV transformer at Huntley/Winnebago with a 75MVA transformer North East-Charlotte 161kV 2 nd Ckt Needs Addressed S Shreve Port-Wallace Lake 138kV FLO Dolet Hills 345/230kV transformer North East-Charlotte 161kV FLO Iatan-Stranger 345kV North East-Charlotte 161kV FLO Iatan-Stranger 345kV North East-Charlotte 161kV FLO Iatan-Stranger 345kV 8

Dolet Hills-Messick 345kV Line Total Cost: $52M Screening Index: 0.63 Total APC Benefit: $5.5M MISO % Total APC Benefit: 90% 9 SPP % Total APC Benefit: 10%

Elm Creek-Moore 345kV Line Total Cost: $142.7M Screening Index: 0.74 Total APC Benefit: $17.9M MISO % Total APC Benefit: 15% 10 SPP % Total APC Benefit: 85%

Huntley-Winnebago Transformer Total Cost: $3.8M Screening Index: 1.57 Total APC Benefit: $1M MISO % Total APC Benefit: 72% 11 SPP % Total APC Benefit: 27%

North East-Charlotte 2 nd Ckt 161kV Total Cost: $24M Screening Index: 1.75 Total APC Benefit: $14M MISO % Total APC Benefit: 52% 12 SPP % Total APC Benefit: 48%

Additional Projects These projects pass the Screening Index but provide minimal benefits (between 1 and 5%) to one RTO Projects could increase when evaluated over 20 years For a project to qualify for interregional cost allocation each RTO must receive at least 5% of benefits

Additional Projects Projects 345 kv switching station where the parallel circuit from Gentleman seperates and construct a 345 kv line from new switching station Axtel Mark Moore to Elm Creek 345kV Elm Creek to Moore 345 kv Replace current 30 MVA 161/69 kv transformer at Huntley/Winnebago with 75 MVA unit Rebuild the South Shreveport to Wallace Lake 138 kv line with 1533.3 ACSR/TW Rebuild Stranger - Iatan 161 kv at 345 kv 161 kv line from Neast to Montreal 2nd 161 kv line from Neast to Charlot 345kV line from Wolcott to Iatan with 345/161kV Wolcott transformer 345 kv circuit from Dolet HIlls to Messick and a new 500/345 kv transformer at the Messick Substation. Rebuild South Shreveport-Wallace Lake 138 kv line to 246/246 MVA Needs Addressed North Platt - Stockville 115 kv FLO Gentleman - Redwillow 345 kv North East-Charlotte 161kV FLO Iatan- Stranger 345kV S Shreve Port-Wallace Lake 138kV FLO Dolet Hills 345/230kV transformer

MISO s Screening Results

Solution Ideas Screening Phase I Issue ID Issue Description Solution Idea Screening Index Estimated Cost (M$ - 2015) M-10 M-13 Swartz - Alto 115 kv FLO Baxter Wilson - Perryville 500 kv Grimes - Mt Zion 138 kv FLO Grimes - Ponderosa 230 kv Alto Series reactor 2.46 10.4 New Walker Tap-Rivtrin 138 kv line 0.59 47.5 M-1 Frederick Town AECI - Frederick Town AMMO 161 kv FLO Lutesville - St Francis 345 kv New St Francois - Fletcher 345 kv line New St Francois - Fletcher - Taum Sauk 345 kv Line 0.53 107.9 0.50 151.8 MISO Annual Fixed Charge rate of 17.9% Project in-service date was assumed to be 2024 16

Alto Series Reactor Project Details Addition of a series reactor on the Swartz Alto 115kV line at the Alto 115kV Substation Location - Louisiana This project does not fully relive the congestion on the Swartz Alto (M-10) constraint Reduces the congestion by 90%

Walker Tap - Rivtrin 138 kv line Project Details Tap the existing Grimes Crockett 345kV line at Walker Tap Build 345/138kV transformer and build 11 miles of 138kV line from Walker Tap to Rivtrin Location - Texas This project completely relieves the Grimes - Mt Zion 138 kv (M-13) constraint

St Francois - Fletcher 345 kv Line Project Details Build 50 miles of 345kV line from St. Francois to Fletcher Location Missouri This project does not fully relive the Frederick Town AECI - Frederick Town AMMO 161 kv constraint It reduces the congestion by 75 % Increases Congestion on the New Madrid 345/161kV Transformer T2 19

St Francois - Taum Sauk - Fletcher 345 kv Line Project Details 55 miles of 345kV line from Fletcher to new substation close to Taum Sauk and then to St. Francois 2-345/138kv transformers to tie in 138kV lines from Taum Sauk Location Missouri This project does not fully relive the Frederick Town AECI - Frederick Town AMMO 161 kv constraint It reduces the congestion by 71 % Increases Congestion on the New Madrid 345/161kV Transformer T2

Contact Info SPP interregionalrelations@spp.org Brett Hooton: 501-688-1684 MISO jmckay@misoenergy.org Jenell McKay: 504-846-7108