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REVENUES (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $3,951.5 $644.9 $— $145.1 $— $— $4,741.5 
Commercial 2,353.4 361.9 — 62.4 — (4.8)2,772.9 
Industrial327.1 107.4 — 4.8 — (13.7)425.6 
Total Retail Tariff Sales Revenues6,632.0 1,114.2 — 212.3 — (18.5)7,940.0 
Wholesale Transmission Revenues— — 1,557.3 — 74.2 (1,290.6)340.9 
Wholesale Market Sales Revenues327.3 43.0 — 3.8 — — 374.1 
Other Revenues from Contracts with Customers74.7 3.6 13.3 7.3 1,161.7 (1,152.0)108.6 
Amortization of/(Reserve for) Revenues Subject to Refund4.6 2.1 — (3.8)— — 2.9 
Total Revenues from Contracts with Customers7,038.6 1,162.9 1,570.6 219.6 1,235.9 (2,461.1)8,766.5 
Alternative Revenue Programs88.1 44.7 (35.2)(4.7)— 37.1 130.0 
Other Revenues5.6 1.1 0.7 0.5 — — 7.9 
Total Operating Revenues$7,132.3 $1,208.7 $1,536.1 $215.4 $1,235.9 $(2,424.0)$8,904.4 
For the Year Ended December 31, 2019
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $3,723.7 $555.1 $— $132.3 $— $— $4,411.1 
Commercial 2,584.8 347.6 — 63.9 — (4.3)2,992.0 
Industrial331.8 96.9 — 4.5 — (11.6)421.6 
Total Retail Tariff Sales Revenues6,640.3 999.6 — 200.7 — (15.9)7,824.7 
Wholesale Transmission Revenues— — 1,293.3 — 61.3 (1,085.2)269.4 
Wholesale Market Sales Revenues215.7 55.4 — 4.1 — — 275.2 
Other Revenues from Contracts with Customers54.8 2.8 13.2 7.0 967.2 (969.0)76.0 
Amortization of/(Reserve for) Revenues Subject to Refund1.3 6.2 — (2.8)— — 4.7 
Total Revenues from Contracts with Customers6,912.1 1,064.0 1,306.5 209.0 1,028.5 (2,070.1)8,450.0 
Alternative Revenue Programs45.9 (4.9)81.8 4.6 — (74.2)53.2 
Other Revenues18.5 3.1 0.7 1.0 — — 23.3 
Total Operating Revenues$6,976.5 $1,062.2 $1,389.0 $214.6 $1,028.5 $(2,144.3)$8,526.5 
For the Year Ended December 31, 2018
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $3,766.6 $542.5 $— $130.7 $— $— $4,439.8 
Commercial 2,634.7 334.8 — 63.3 — (4.5)3,028.3 
Industrial351.9 96.0 — 4.4 — (10.0)442.3 
Total Retail Tariff Sales Revenues6,753.2 973.3 — 198.4 — (14.5)7,910.4 
Wholesale Transmission Revenues— — 1,308.9 — 47.3 (1,092.2)264.0 
Wholesale Market Sales Revenues179.5 57.5 — 4.1 — — 241.1 
Other Revenues from Contracts with Customers65.9 (2.2)12.6 7.2 889.0 (891.0)81.5 
Reserve for Revenues Subject to Refund(12.3)(8.3)— (3.7)— — (24.3)
Total Revenues from Contracts with Customers6,986.3 1,020.3 1,321.5 206.0 936.3 (1,997.7)8,472.7 
Alternative Revenue Programs(47.0)(1.2)(35.2)5.4 — 31.9 (46.1)
Other Revenues17.9 3.1 — 0.6 — — 21.6 
Total Operating Revenues$6,957.2 $1,022.2 $1,286.3 $212.0 $936.3 $(1,965.8)$8,448.2 
For the Years Ended December 31,
202020192018
(Millions of Dollars)CL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential $2,011.1 $1,365.8 $574.6 $1,837.1 $1,322.1 $564.5 $1,828.2 $1,380.9 $557.5 
Commercial 878.3 1,176.8 299.9 922.9 1,349.4 314.6 928.1 1,391.5 316.9 
Industrial137.5 106.4 83.2 138.3 115.8 77.7 147.7 124.9 79.3 
Total Retail Tariff Sales Revenues3,026.9 2,649.0 957.7 2,898.3 2,787.3 956.8 2,904.0 2,897.3 953.7 
Wholesale Transmission Revenues754.8 576.5 226.0 587.1 517.3 188.9 620.6 488.8 199.5 
Wholesale Market Sales Revenues230.1 58.4 38.8 105.1 73.1 37.5 48.3 76.1 56.6 
Other Revenues from Contracts
with Customers		32.9 43.6 14.2 36.4 18.7 15.6 35.0 28.9 15.5 
Amortization of/(Reserve for)
Revenues Subject to Refund		— — 4.6 — — 1.3 — — (12.3)
Total Revenues from Contracts
with Customers		4,044.7 3,327.5 1,241.3 3,626.9 3,396.4 1,200.1 3,607.9 3,491.1 1,213.0 
Alternative Revenue Programs(4.2)54.5 2.6 77.5 41.6 8.6 (65.9)0.9 (17.3)
Other Revenues2.2 3.5 0.6 10.3 7.0 1.9 8.5 8.3 1.1 
Eliminations(495.2)(444.4)(165.4)(482.1)(400.4)(144.7)(454.3)(387.4)(149.2)
Total Operating Revenues$3,547.5 $2,941.1 $1,079.1 $3,232.6 $3,044.6 $1,065.9 $3,096.2 $3,112.9 $1,047.6