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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, 2023 | Dec. 31, 2022
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 19,656,500 | $ 18,326,200
Distribution - Natural Gas | 8,155,300 | 7,443,800
Transmission - Electric | 14,666,800 | 13,709,300
Distribution - Water | 2,280,100 | 2,112,600
Solar | 201,100 | 200,800
Utility | 44,959,800 | 41,792,700
Other | 2,006,800 | 1,738,100
Property, Plant and Equipment, Gross | 46,966,600 | 43,530,800
Less: Accumulated Depreciation |  |
Utility | (9,670,100) | (9,167,400)
Other | (869,600) | (706,100)
Total Accumulated Depreciation | (10,539,700) | (9,873,500)
Property, Plant and Equipment, Net | 36,426,900 | 33,657,300
Construction Work in Progress | 3,071,700 | 2,455,500
Total Property, Plant and Equipment, Net | 39,498,607 | 36,112,820
CL&P |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,897,100 | 7,370,100
Transmission - Electric | 6,548,200 | 6,165,100
Solar | 0 | 0
Property, Plant and Equipment, Gross | 14,445,300 | 13,535,200
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,670,500) | (2,567,100)
Property, Plant and Equipment, Net | 11,774,800 | 10,968,100
Construction Work in Progress | 565,400 | 498,900
Total Property, Plant and Equipment, Net | 12,340,192 | 11,467,024
NSTAR Electric |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 9,000,500 | 8,410,000
Transmission - Electric | 5,630,800 | 5,333,800
Solar | 201,100 | 200,800
Property, Plant and Equipment, Gross | 14,832,400 | 13,944,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,585,900) | (3,381,200)
Property, Plant and Equipment, Net | 11,246,500 | 10,563,400
Construction Work in Progress | 1,507,300 | 1,063,600
Total Property, Plant and Equipment, Net | 12,753,787 | 11,626,968
PSNH |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,799,200 | 2,586,400
Transmission - Electric | 2,489,500 | 2,212,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,288,700 | 4,798,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (984,000) | (912,300)
Property, Plant and Equipment, Net | 4,304,700 | 3,886,100
Construction Work in Progress | 270,000 | 174,100
Total Property, Plant and Equipment, Net | $ 4,574,652 | $ 4,060,224

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