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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 18,132,200 | $ 17,679,100
Distribution - Natural Gas | 7,020,100 | 6,694,800
Transmission - Electric | 13,371,200 | 12,882,400
Distribution - Water | 1,971,100 | 1,900,900
Solar | 200,900 | 200,900
Utility | 40,695,500 | 39,358,100
Other | 1,663,400 | 1,469,500
Property, Plant and Equipment, Gross | 42,358,900 | 40,827,600
Less: Accumulated Depreciation |  |
Utility | (9,070,000) | (8,885,200)
Other | (672,900) | (580,100)
Total Accumulated Depreciation | (9,742,900) | (9,465,300)
Property, Plant and Equipment, Net | 32,616,000 | 31,362,300
Construction Work in Progress | 2,413,500 | 2,015,400
Total Property, Plant and Equipment, Net | 35,029,497 | 33,377,650
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,297,200 | 7,117,600
Transmission - Electric | 6,022,800 | 5,859,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 13,320,000 | 12,976,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,571,500) | (2,572,100)
Property, Plant and Equipment, Net | 10,748,500 | 10,404,500
Construction Work in Progress | 478,200 | 399,000
Total Property, Plant and Equipment, Net | 11,226,672 | 10,803,543
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,329,100 | 8,105,500
Transmission - Electric | 5,243,300 | 5,090,500
Solar | 200,900 | 200,900
Property, Plant and Equipment, Gross | 13,773,300 | 13,396,900
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,322,300) | (3,227,300)
Property, Plant and Equipment, Net | 10,451,000 | 10,169,600
Construction Work in Progress | 914,200 | 707,000
Total Property, Plant and Equipment, Net | 11,365,172 | 10,876,614
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,546,200 | 2,496,200
Transmission - Electric | 2,106,800 | 1,934,600
Solar | 0 | 0
Property, Plant and Equipment, Gross | 4,653,000 | 4,430,800
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (908,200) | (908,400)
Property, Plant and Equipment, Net | 3,744,800 | 3,522,400
Construction Work in Progress | 172,800 | 134,100
Total Property, Plant and Equipment, Net | $ 3,917,559 | $ 3,656,462

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