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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, 2022 | Dec. 31, 2021
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 18,326,200 | $ 17,679,100
Distribution - Natural Gas | 7,443,800 | 6,694,800
Transmission - Electric | 13,709,300 | 12,882,400
Distribution - Water | 2,112,600 | 1,900,900
Solar | 200,800 | 200,900
Utility | 41,792,700 | 39,358,100
Other | 1,738,100 | 1,469,500
Property, Plant and Equipment, Gross | 43,530,800 | 40,827,600
Less: Accumulated Depreciation |  |
Utility | (9,167,400) | (8,885,200)
Other | (706,100) | (580,100)
Total Accumulated Depreciation | (9,873,500) | (9,465,300)
Property, Plant and Equipment, Net | 33,657,300 | 31,362,300
Construction Work in Progress | 2,455,500 | 2,015,400
Total Property, Plant and Equipment, Net | 36,112,820 | 33,377,650
CL&P |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,370,100 | 7,117,600
Transmission - Electric | 6,165,100 | 5,859,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 13,535,200 | 12,976,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,567,100) | (2,572,100)
Property, Plant and Equipment, Net | 10,968,100 | 10,404,500
Construction Work in Progress | 498,900 | 399,000
Total Property, Plant and Equipment, Net | 11,467,024 | 10,803,543
NSTAR Electric |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,410,000 | 8,105,500
Transmission - Electric | 5,333,800 | 5,090,500
Solar | 200,800 | 200,900
Property, Plant and Equipment, Gross | 13,944,600 | 13,396,900
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,381,200) | (3,227,300)
Property, Plant and Equipment, Net | 10,563,400 | 10,169,600
Construction Work in Progress | 1,063,600 | 707,000
Total Property, Plant and Equipment, Net | 11,626,968 | 10,876,614
PSNH |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,586,400 | 2,496,200
Transmission - Electric | 2,212,000 | 1,934,600
Solar | 0 | 0
Property, Plant and Equipment, Gross | 4,798,400 | 4,430,800
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (912,300) | (908,400)
Property, Plant and Equipment, Net | 3,886,100 | 3,522,400
Construction Work in Progress | 174,100 | 134,100
Total Property, Plant and Equipment, Net | $ 4,060,224 | $ 3,656,462

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