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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Investment in Utility Property, Plant and Equipment By Asset (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Distribution - Electric $ 21,144,100 $ 19,656,500
Distribution - Natural Gas 8,922,200 8,155,300
Transmission - Electric 16,130,900 14,666,800
Distribution - Water (1) 0 2,280,100
Solar 201,000 201,100
Utility 46,398,200 44,959,800
Other 2,254,100 2,006,800
Property, Plant and Equipment, Gross 48,652,300 46,966,600
Less:  Accumulated Depreciation    
Utility     (9,636,500) (9,670,100)
Other (1,044,100) (869,600)
Total Accumulated Depreciation (10,680,600) (10,539,700)
Property, Plant and Equipment, Net 37,971,700 36,426,900
Construction Work in Progress 3,014,900 3,071,700
Total Property, Plant and Equipment, Net 40,986,578 39,498,607
CL&P    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 8,437,900 7,897,100
Transmission - Electric 6,937,700 6,548,200
Solar 0 0
Property, Plant and Equipment, Gross 15,375,600 14,445,300
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (2,928,000) (2,670,500)
Property, Plant and Equipment, Net 12,447,600 11,774,800
Construction Work in Progress 554,600 565,400
Total Property, Plant and Equipment, Net 13,002,193 12,340,192
NSTAR Electric    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 9,782,300 9,000,500
Transmission - Electric 6,375,200 5,630,800
Solar 201,000 201,100
Property, Plant and Equipment, Gross 16,358,500 14,832,400
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (3,782,000) (3,585,900)
Property, Plant and Equipment, Net 12,576,500 11,246,500
Construction Work in Progress 1,461,300 1,507,300
Total Property, Plant and Equipment, Net 14,037,828 12,753,787
PSNH    
Property, Plant and Equipment [Line Items]    
Distribution - Electric 2,964,200 2,799,200
Transmission - Electric 2,819,600 2,489,500
Solar 0 0
Property, Plant and Equipment, Gross 5,783,800 5,288,700
Less:  Accumulated Depreciation    
Total Accumulated Depreciation (1,032,300) (984,000)
Property, Plant and Equipment, Net 4,751,500 4,304,700
Construction Work in Progress 338,400 270,000
Total Property, Plant and Equipment, Net $ 5,089,943 $ 4,574,652