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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 18,618,600 | $ 18,326,200
Distribution - Natural Gas | 7,562,800 | 7,443,800
Transmission - Electric | 13,884,000 | 13,709,300
Distribution - Water | 2,122,500 | 2,112,600
Solar | 200,800 | 200,800
Utility | 42,388,700 | 41,792,700
Other | 1,791,700 | 1,738,100
Property, Plant and Equipment, Gross | 44,180,400 | 43,530,800
Less: Accumulated Depreciation |  |
Utility | (9,317,700) | (9,167,400)
Other | (744,700) | (706,100)
Total Accumulated Depreciation | (10,062,400) | (9,873,500)
Property, Plant and Equipment, Net | 34,118,000 | 33,657,300
Construction Work in Progress | 2,626,900 | 2,455,500
Total Property, Plant and Equipment, Net | 36,744,855 | 36,112,820
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,510,800 | 7,370,100
Transmission - Electric | 6,235,200 | 6,165,100
Solar | 0 | 0
Property, Plant and Equipment, Gross | 13,746,000 | 13,535,200
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,610,400) | (2,567,100)
Property, Plant and Equipment, Net | 11,135,600 | 10,968,100
Construction Work in Progress | 494,700 | 498,900
Total Property, Plant and Equipment, Net | 11,630,278 | 11,467,024
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,516,700 | 8,410,000
Transmission - Electric | 5,382,800 | 5,333,800
Solar | 200,800 | 200,800
Property, Plant and Equipment, Gross | 14,100,300 | 13,944,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,429,300) | (3,381,200)
Property, Plant and Equipment, Net | 10,671,000 | 10,563,400
Construction Work in Progress | 1,148,000 | 1,063,600
Total Property, Plant and Equipment, Net | 11,819,012 | 11,626,968
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,631,400 | 2,586,400
Transmission - Electric | 2,267,600 | 2,212,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 4,899,000 | 4,798,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (940,000) | (912,300)
Property, Plant and Equipment, Net | 3,959,000 | 3,886,100
Construction Work in Progress | 189,000 | 174,100
Total Property, Plant and Equipment, Net | $ 4,147,985 | $ 4,060,224

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