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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, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 17,679,100 | $ 16,703,200
Distribution - Natural Gas | 6,694,800 | 6,111,200
Transmission - Electric | 12,882,400 | 11,954,000
Distribution - Water | 1,900,900 | 1,743,100
Solar | 200,900 | 201,500
Utility | 39,358,100 | 36,713,000
Other | 1,469,500 | 1,269,000
Property, Plant and Equipment, Gross | 40,827,600 | 37,982,000
Less: Accumulated Depreciation |  |
Utility | (8,885,200) | (8,476,300)
Other | (580,100) | (477,600)
Total Accumulated Depreciation | (9,465,300) | (8,953,900)
Property, Plant and Equipment, Net | 31,362,300 | 29,028,100
Construction Work in Progress | 2,015,400 | 1,854,400
Total Property, Plant and Equipment, Net | 33,377,650 | 30,882,523
The Connecticut Light and Power Company |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,117,600 | 6,820,700
Transmission - Electric | 5,859,000 | 5,512,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 12,976,600 | 12,332,700
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,572,100) | (2,475,400)
Property, Plant and Equipment, Net | 10,404,500 | 9,857,300
Construction Work in Progress | 399,000 | 377,300
Total Property, Plant and Equipment, Net | 10,803,543 | 10,234,556
NSTAR Electric Company |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,105,500 | 7,544,400
Transmission - Electric | 5,090,500 | 4,701,300
Solar | 200,900 | 201,500
Property, Plant and Equipment, Gross | 13,396,900 | 12,447,200
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,227,300) | (3,074,100)
Property, Plant and Equipment, Net | 10,169,600 | 9,373,100
Construction Work in Progress | 707,000 | 750,000
Total Property, Plant and Equipment, Net | 10,876,614 | 10,123,062
Public Service Company of New Hampshire |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,496,200 | 2,378,400
Transmission - Electric | 1,934,600 | 1,742,400
Solar | 0 | 0
Property, Plant and Equipment, Gross | 4,430,800 | 4,120,800
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (908,400) | (848,900)
Property, Plant and Equipment, Net | 3,522,400 | 3,271,900
Construction Work in Progress | 134,100 | 102,400
Total Property, Plant and Equipment, Net | $ 3,656,462 | $ 3,374,270

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