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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 20,467,300 | $ 19,656,500
Distribution - Natural Gas | 8,358,900 | 8,155,300
Transmission - Electric | 15,589,600 | 14,666,800
Distribution - Water | 2,313,500 | 2,280,100
Solar | 201,100 | 201,100
Utility | 46,930,400 | 44,959,800
Other | 2,193,600 | 2,006,800
Property, Plant and Equipment, Gross | 49,124,000 | 46,966,600
Less: Accumulated Depreciation |  |
Utility | (10,110,400) | (9,670,100)
Other | (964,400) | (869,600)
Total Accumulated Depreciation | (11,074,800) | (10,539,700)
Property, Plant and Equipment, Net | 38,049,200 | 36,426,900
Construction Work in Progress | 3,077,000 | 3,071,700
Total Property, Plant and Equipment, Net | 41,126,153 | 39,498,607
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,270,000 | 7,897,100
Transmission - Electric | 6,790,700 | 6,548,200
Solar | 0 | 0
Property, Plant and Equipment, Gross | 15,060,700 | 14,445,300
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,884,400) | (2,670,500)
Property, Plant and Equipment, Net | 12,176,300 | 11,774,800
Construction Work in Progress | 512,300 | 565,400
Total Property, Plant and Equipment, Net | 12,688,615 | 12,340,192
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 9,378,400 | 9,000,500
Transmission - Electric | 6,146,500 | 5,630,800
Solar | 201,100 | 201,100
Property, Plant and Equipment, Gross | 15,726,000 | 14,832,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,706,600) | (3,585,900)
Property, Plant and Equipment, Net | 12,019,400 | 11,246,500
Construction Work in Progress | 1,303,500 | 1,507,300
Total Property, Plant and Equipment, Net | 13,322,862 | 12,753,787
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,859,100 | 2,799,200
Transmission - Electric | 2,654,100 | 2,489,500
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,513,200 | 5,288,700
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (1,016,500) | (984,000)
Property, Plant and Equipment, Net | 4,496,700 | 4,304,700
Construction Work in Progress | 336,700 | 270,000
Total Property, Plant and Equipment, Net | $ 4,833,400 | $ 4,574,652

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