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28 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12) Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 Service Present Proposed PSCR Clause Restucturing Surcharge Residential Service MR-1 Customer Charge per Month $ 4.25 $ 7.25 Distribution Energy Charge per kwh Supply Service Energy Charge per kwh (SC1) Residential Time of Day Service MR-2 Customer Charge per Month $ 6.75 $ 7.25 Distribution Energy Charge per kwh Supply Service Energy Charge per kwh On-Peak (SC3) Off-Peak (SC3) Automatic Outdoor Lighting MOL Watt Mercury Vapor $ 7.69 $ Watt Mercury Vapor $ $ Watt Sodium Vapor $ 6.15 $ Watt Sodium Vapor $ 8.85 $ Watt Sodium Vapor $ $ Small Commercial Service MSC-1 Customer Charge per Month Single Phase $ 7.50 $ Three Phase $ $ Distribution Energy Charge per kwh Supply Service Energy Charge per kwh (SC2) Athletic Field Rider MA-1 Single Phase $ 7.50 $ Three Phase $ $ Small General Time-of-Day Service MST-1 Customer Charge per Month Single Phase $ $ Three Phase $ $ Distribution Energy Charge per kwh Supply Service Energy Charge per kwh On-Peak (SC4) Off-Peak (SC4) F-6 RateSumm of Exh A-12 F2-F Rate design.xls

29 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12) Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 Service Present Proposed Commercial Industrial MCI-1 Customer Charge per Month $ $ Distribution Energy Charge per kwh Primary Voltage Energy Discount 2% 20% Distribution Demand Charge per kw Secondary Voltage $ 2.17 $ 1.50 Primary Voltage $ 2.07 $ 1.20 Supply Energy Charge per kwh (SC5) Secondary Voltage Primary Voltage Energy Discount 2% 2% Supply Demand Charge per kw (SC5) Secondary Voltage $ 5.28 $ 7.45 Primary Voltage Demand Discount $ 5.05 $ 7.30 High Load Factor discount per kwh (0.6000) (0.7000) Hours limitation 400 hours 400 hours Experimental Load Control Rider MLC-1 Monthly Credit per kw $ (3.00) $ (3.00) Industrial General Service MI-1 Customer Charge per Month Mandatory $ $ Optional $ $ Distribution Energy Charge per kwh Secondary Primary Voltage Discount 2.0% 20.0% Trans. Transformed Voltage Discount 5.5% 40.0% Trans. Untransformed Voltage Discount 6.0% 100.0% Distribution Demand Charge per kw Secondary Voltage $ 1.50 $ 1.50 Primary Voltage $ 0.90 $ 1.20 Trans. Transformed Voltage $ 0.40 $ 0.90 Trans. Untransformed Voltage $ - $ - Supply Service Energy Charge per kwh (SC6) Secondary On-Peak Secondary Off-Peak Primary Voltage Energy Discount 2.0% 2.0% Trans. Trans. Energy Discount 5.5% 5.5% Trans. Untrans. Energy Discount 6.0% 6.0% Supply Service Demand Charge per kw Secondary Voltage $ 6.75 $ 7.45 Primary Voltage $ 5.65 $ 7.30 Trans. Transformed Voltage $ 5.20 $ 6.90 Trans. Untransformed Voltage $ 5.17 $ 6.50 F-6 RateSumm High of Load Exh A-12 Factor F2-F6 discount 2011 Rate per design.xls kwh (0.6000) (0.7000) Hours limitation 400 hours 400 hours

30 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12) Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 Service Present Proposed Peak Controlled Time-of-Day Service MPC-1 Customer Charge per Month Demands over 1000kW $ $ Demands under 1000 kw $ $ Distribution Energy Charge per kwh Secondary Primary Voltage Discount 2.0% 20.0% Trans. Transformed Voltage Discount 5.5% 40.0% Trans. Untransformed Voltage Discount 6.0% 100.0% Distribution Demand Charge per kw Secondary Voltage $ 1.50 $ 1.50 Primary Voltage $ 0.90 $ 1.20 Trans. Transformed Voltage $ 0.40 $ 0.90 Trans. Untransformed Voltage $ - $ - Supply Service Energy Charge per kwh (SC9) On-Peak Off-Peak Primary Voltage Energy Discount 2.0% 2.0% Trans. Trans. Energy Discount 5.5% 5.5% Trans. Untrans. Energy Discount 6.0% 6.0% Supply Service Onpeak Firm Demand Charge per kw (SC9) Secondary Voltage $ 6.75 $ 7.45 Primary Voltage $ 5.65 $ 7.30 Trans. Transformed Voltage $ 5.20 $ 6.90 Trans. Untransformed Voltage $ 5.17 $ 6.50 Supply Service Onpeak Controlled Demand Charge per kw (SC9) Secondary Voltage $ 3.68 $ 4.05 Primary Voltage $ 2.58 $ 2.95 Trans. Transformed Voltage $ 2.13 $ 2.50 Trans. Untransformed Voltage $ 2.10 $ 2.47 High Load Factor discount per kwh (0.6000) (0.7000) Hours limitation 400 hours 400 hours F-6 RateSumm of Exh A-12 F2-F Rate design.xls

31 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12) Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 Service Present Proposed Peak Controlled General Service MPC-2 Customer Charge per Month $ $ Distribution Energy Charge per kwh Primary Voltage Energy Discount 2% 20% Distribution Demand Charge per kw Secondary Voltage $ 2.17 $ 1.50 Primary Voltage $ 2.07 $ 1.20 Supply Energy Charge per kwh (SC10) Secondary Voltage Primary Voltage Energy Discount 2% 2% Supply Service Firm Demand Charge per kw (SC10) Secondary Voltage $ 5.28 $ 7.45 Primary Voltage $ 5.05 $ 7.30 Supply Service Controlled Demand Charge per kw (SC10) Secondary Voltage $ % $ 3.10 Primary Voltage $ 1.98 $ 3.04 High Load Factor discount per kwh (0.6000) (0.7000) Hours limitation 400 hours 400 hours Optional Off-Peak Service MOP-1 Customer Charge per Month single phase $ 3.00 $ 4.00 three phase $ 8.00 $ Distribution Energy Charge per kwh Primary Voltage Energy Discount 2% 20% Supply Service Energy Charge per kwh (SC7) Primary Voltage Energy Discount 2% 2% Supply Service non-authorized (on-peak) Energy Charge per kwh (SC7) Municipal Water Pumping MPA-1 Customer Charge per Month Single Phase $ 7.50 $ Three Phase $ $ Distribution Energy Charge per kwh Supply Service Energy Charge per kwh (SC8) F-6 RateSumm of Exh A-12 F2-F Rate design.xls

32 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12) Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 Service Present Proposed Street Lighting MSL-1 Company Owned 250 Watt Mercury Vapor $ $ Watt Mercury Vapor $ $ Watt Sodium Vapor $ 8.20 $ Watt Sodium Vapor $ 8.95 $ Watt Sodium Vapor $ 9.85 $ Watt Sodium Vapor $ $ Watt Sodium Vapor $ $ Customer Owned-Energy & Maintenance 250 Watt Mercury Vapor $ 5.50 $ Watt Mercury Vapor $ 7.70 $ Watt Sodium Vapor $ 3.25 $ Watt Sodium Vapor $ 3.85 $ Watt Sodium Vapor $ 4.50 $ Watt Sodium Vapor $ 6.45 $ Watt Sodium Vapor $ 8.60 $ Non-Metered LED Street lighting Dusk to dawn lighting per watt of unit rating hour lighting per watt of unit rating WindSource MWS $ - /100 kwh $ 1.20 /100 kwh Net Metering Program (less than 20kW) PG-1 Net Metering Program ( kw) Net Metering Program ( kw) Pole Attachments PG-2 PG-3 PA-1 F-6 RateSumm of Exh A-12 F2-F Rate design.xls

33 Northern States Power Company-Wisconsin Case No. U Electric Utility-Michigan Jurisdiction Exhibit A-12 (DRD-12), Comparison of Present and Proposed Rate Levels Schedule No. F-6, Page Test Year Witness: D. R. Dahl Date: December, 2010 PSCR Calculation 2009 Actual Present rates Proposed Rates (1) WI Gross Fuel (w/o handling) Case U R $16,844, (2) NSPW I/A Bill to NSPM Case U R ($64,059,473.26) Case U Case U (3) NSPM I/A Bill to NSPW Case U R $352,435, (4) Total Net WI PSCR Costs (1)+(2)+(3) $305,220, $361,641, $361,641, (5) NSPW Requirements MWh's 7,511,050 7,585,842 7,585,842 (6) 2009 "New" Base / 2011 cost per MW (4)/(5) $ $ $ (7) Loss Adjustment Order in Case U % 10.01% 10.01% (8) New Base Adjusted for Losses (6)*[1+(7)] $ $ $ (9) Current Authorized PSCR Base Order in Case U $22.42 $22.42 $40.64 Case U (10) Loss Adjustment Order in Case U % 10.01% 10.01% (11) Current Base Adjusted for Losses (9)*[1+(10)] $ $ $ (12) Current PSCR Factor per MWh (8) - (11) $ $ $ (13) Current PSCR Factor per kwh (12) / 1000 $ $ $ (14) True-up from previous year Case U R (15) PSCR Factor per kwh with True-up (12) + (14) $ $