Niagara Mohawk Power Corporation d/b/a National Grid

THE FILING OF REVISED RATES TO P.S.C. NO. 220 ELECTRICITY, P.S.C. NO. 214 STREETLIGHTING, and P.S.C. NO. 219 GAS TARIFFS TO COMPLY WITH THE COMMISSION’S ORDER DATED JANUARY 20, 2022 IN P.S.C. CASES 20-E-0380 AND 20-G-0381.

Notice is hereby given that Niagara Mohawk Power Corporation d/b/a National Grid has filed revised rates with the Public Service Commission to comply with the Commission’s order dated January 20, 2022. ese revised rates become effective July 1, 2023.

Electric Rates Service Classification No. 1 – Residential Current Rates Rates Effective July 1, 2023 Basic Service Charge $17.33 $17.33 Distribution Delivery Charge per kWh $0.06744 $0.07104 Service Classification No. 1C – Time of Use Residential Current Rates Rates Effective July 1, 2023 Basic Service Charge $30.62 $30.62 Distribution Delivery Charge per kWh $0.03693 $0.03795 Service Classification No. 2 – Non-Demand Small General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $21.02 $21.02 Distribution Delivery per kWh $0.07596 $0.08035 Service Classification No. 2 – Demand Small General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $53.57 $53.57 Distribution Delivery per kW $13.46 $14.01 Service Classification No. 3 – Secondary Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $625.00 $675.00 Distribution Delivery per kW $11.38 $11.66 Service Classification No. 3 – Primary Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $650.00 $700.00 Distribution Delivery per kW $10.30 $10.62 Service Classification No. 3 – Sub Transmission/Transmission Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $1,050.00 $1,150.00 Distribution Delivery per kW $3.15 $3.27 Service Classification No. 3 A– Secondary/Primary Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $2,750.00 $3,000.00 Distribution Delivery per kW $11.42 $11.84 Service Classification No. 3 A – Sub Transmission Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $3,350.00 $3,700.00 Distribution Delivery per kW $3.98 $4.12 Service Classification No. 3 A– Transmission Large General Service Current Rates Rates Effective July 1, 2023 Basic Service Charge $6,900.00 $7,500.00 Distribution Delivery per kW $3.89 $4.20

For more information, visit http://www.nationalgridus.com or the PSC’s website: https://dps.ny.gov/

PURPOSE: P.S.C. NO. 214 Service Classification No. 1 – Private Lighting Current Rates Rates Effective July 1, 2023 Distribution Delivery Charge per kWh $0.09158 $0.09414 Service Classification No. 2/5 – Street Lighting Current Rates Rates Effective July 1, 2023 Distribution Delivery Charge per kWh $0.09158 $0.09414

Service Classification No. 4 – Traffiic Controls Current Rates Rates Effective July 1, 2023 Distribution Delivery Charge per kWh $0.01143 $0.01175 For more information, visit http://www.nationalgridus.com or the PSC’s website: https://dps.ny.gov/ Continued on next page

P.S.C. NO. 214 Service Classification No. 3/6 – Street Lighting Current Rates Rates Effective July 1, 2023 Distribution Delivery Charge per kWh $0.06287 $0.06463 Gas Rates Service Classification No. 1 – Residential Monthly usage Current Rates Rates Effective July 1, 2023 First 3 therms or less $21.40 $21.40 Next 47 therms, per therm $0.59964 $0.64616 Over 50 therms, per therm $0.13003 $0.14012 Service Classification No. 2 – Small General Service Monthly usage Current Rates Rates Effective July 1, 2023 First 3 therms or less $26.00 $26.00 Next 277 therms, per therm $0.37571 $0.39434 Next 4,720 therms, per therm $0.22641 $0.23763 Over 5,000 therms, per therm $0.08077 $0.08480 Service Classification No. 5 – Firm Gas Sales and Transportation Service Monthly usage Current Rates Rates Effective July 1, 2023 First 100 therms or less $684.00 $718.00 Over 100 therms, per therm $0.08601 $0.08930 Service Classification No. 6 – Large Volume Interruptible Delivery Service Monthly usage Current Rates Rates Effective July 1, 2023 First 100 therms or less $581.27 $581.27 Over 100 therms, per therm $0.04398 $0.04732 Service Classification No. 7 – Small Volume Firm Sales and Transportation Service Monthly usage Current Rates Rates Effective July 1, 2023 First 2,100 therms or less $350.00 $350.00 Next 400 therms, per therm $0.38778 $0.43298 Next 1,700 therms, per therm $0.29067 $0.32296 Over 4,200 therms, per therm $0.11869 $0.13129 Service Classification No. 8 – Gas Sales and Transportation Service with Standby Sales Service Monthly usage Current Rates Rates Effective July 1, 2023 First 100 therms or less $1,600.00 $1,650.00 Next 99,900 therms, per therm $0.08845 $0.09270 Next 400,000 therms, per therm $0.08325 $0.08725 Over 500,000 therms, per therm $0.07182 $0.07528 Classification No. 12 – Distributed Generation Service Less than 250,000 therms per year Monthly usage Current Rates Rates Effective July 1, 2023 First 3 therms or less $200.00 $200.00 Over 3 therms, per therm (Apr to Oct) $0.04621 $0.04809 Over 3 therms, per therm (Nov to Mar) $0.06108 $0.06463 Classification No. 12 – Distributed Generation Service Greater than 250,000 but less than 1,000,000 therms per year Monthly usage Current Rates Rates Effective July 1, 2023 First 3 therms or less $500.00 $500.00 Over 3 therms, per therm (Apr to Oct) $0.04348 $0.04606 Over 3 therms, per therm (Nov to Mar) $0.05466 $0.05760