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REVENUES (Tables)
 12 Months Ended
Dec. 31, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following tables present operating revenues disaggregated by revenue source:
For the Year Ended December 31, 2025
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $5,215.5 $1,474.9 $— $167.8 $— $— $6,858.2 
Commercial 3,273.4 716.3 — 71.1 — (8.9)4,051.9 
Industrial421.6 210.0 — 4.8 — (26.1)610.3 
Total Retail Tariff Sales Revenues8,910.5 2,401.2 — 243.7 — (35.0)11,520.4 
Wholesale Transmission Revenues— — 2,452.1 — — (1,786.8)665.3 
Wholesale Market Sales Revenues1,004.7 184.0 — 4.4 — — 1,193.1 
Other Revenues from Contracts with Customers88.3 5.8 14.4 2.6 1,732.7 (1,729.5)114.3 
Total Revenues from Contracts with Customers10,003.5 2,591.0 2,466.5 250.7 1,732.7 (3,551.3)13,493.1 
Alternative Revenue Programs17.2 40.8 (183.7)(15.0)— 171.2 30.5 
Other Revenues18.9 3.0 0.5 1.2 — — 23.6 
Total Operating Revenues$10,039.6 $2,634.8 $2,283.3 $236.9 $1,732.7 $(3,380.1)$13,547.2 
For the Year Ended December 31, 2024
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $4,904.8 $1,129.1 $— $150.4 $— $— $6,184.3 
Commercial 2,973.3 588.0 — 70.3 — (7.7)3,623.9 
Industrial389.0 172.5 — 4.7 — (22.4)543.8 
Total Retail Tariff Sales Revenues8,267.1 1,889.6 — 225.4 — (30.1)10,352.0 
Wholesale Transmission Revenues— — 2,032.4 — — (1,529.3)503.1 
Wholesale Market Sales Revenues658.9 161.9 — 4.2 — — 825.0 
Other Revenues from Contracts with Customers92.2 5.1 13.9 3.8 1,701.3 (1,694.6)121.7 
Total Revenues from Contracts with Customers9,018.2 2,056.6 2,046.3 233.4 1,701.3 (3,254.0)11,801.8 
Alternative Revenue Programs28.7 44.5 74.2 (5.3)— (67.2)74.9 
Other Revenues19.6 2.8 0.5 1.2 — — 24.1 
Total Operating Revenues$9,066.5 $2,103.9 $2,121.0 $229.3 $1,701.3 $(3,321.2)$11,900.8 
For the Year Ended December 31, 2023
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $5,054.2 $1,145.4 $— $144.7 $— $— $6,344.3 
Commercial 2,893.2 637.7 — 69.8 — (4.8)3,595.9 
Industrial352.4 186.8 — 4.5 — (19.7)524.0 
Total Retail Tariff Sales Revenues8,299.8 1,969.9 — 219.0 — (24.5)10,464.2 
Wholesale Transmission Revenues— — 1,777.5 — — (1,310.5)467.0 
Wholesale Market Sales Revenues625.0 206.7 — 3.9 — — 835.6 
Other Revenues from Contracts with Customers82.6 5.6 18.9 8.1 1,636.6 (1,628.0)123.8 
Total Revenues from Contracts with Customers9,007.4 2,182.2 1,796.4 231.0 1,636.6 (2,963.0)11,890.6 
Alternative Revenue Programs(54.3)35.5 118.9 0.4 — (106.5)(6.0)
Other Revenues20.4 4.0 0.6 1.1 — — 26.1 
Total Operating Revenues$8,973.5 $2,221.7 $1,915.9 $232.5 $1,636.6 $(3,069.5)$11,910.7 
For the Years Ended December 31,
202520242023
(Millions of Dollars)CL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $2,716.1 $1,802.6 $696.8 $2,493.7 $1,771.8 $639.3 $2,597.8 $1,691.0 $765.4 
Commercial 1,263.9 1,650.0 361.7 1,164.8 1,466.7 343.6 1,082.1 1,442.3 369.6 
Industrial175.4 143.3 102.9 164.2 118.1 106.7 137.2 123.2 92.0 
Total Retail Tariff Sales Revenues4,155.4 3,595.9 1,161.4 3,822.7 3,356.6 1,089.6 3,817.1 3,256.5 1,227.0 
Wholesale Transmission Revenues1,037.8 901.1 513.2 870.8 794.1 367.5 794.7 692.0 290.8 
Wholesale Market Sales Revenues801.3 169.6 33.8 491.9 131.1 35.9 429.1 131.8 64.1 
Other Revenues from Contracts
   with Customers		36.1 46.5 22.5 36.7 50.2 21.2 36.7 49.1 18.1 
Total Revenues from Contracts
   with Customers		6,030.6 4,713.1 1,730.9 5,222.1 4,332.0 1,514.2 5,077.6 4,129.4 1,600.0 
Alternative Revenue Programs(79.2)(4.9)(82.4)45.4 36.7 20.8 66.8 (52.0)49.8 
Other Revenues6.8 9.7 2.9 9.0 8.5 2.6 9.6 8.4 3.0 
Eliminations(717.2)(731.3)(275.0)(661.5)(656.3)(243.1)(575.2)(570.3)(204.9)
Total Operating Revenues$5,241.0 $3,986.6 $1,376.4 $4,615.0 $3,720.9 $1,294.5 $4,578.8 $3,515.5 $1,447.9