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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, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 21,144,100 | $ 19,656,500
Distribution - Natural Gas | 8,922,200 | 8,155,300
Transmission - Electric | 16,130,900 | 14,666,800
Distribution - Water (1) | 0 | 2,280,100
Solar | 201,000 | 201,100
Utility | 46,398,200 | 44,959,800
Other | 2,254,100 | 2,006,800
Property, Plant and Equipment, Gross | 48,652,300 | 46,966,600
Less: Accumulated Depreciation |  |
Utility | (9,636,500) | (9,670,100)
Other | (1,044,100) | (869,600)
Total Accumulated Depreciation | (10,680,600) | (10,539,700)
Property, Plant and Equipment, Net | 37,971,700 | 36,426,900
Construction Work in Progress | 3,014,900 | 3,071,700
Total Property, Plant and Equipment, Net | 40,986,578 | 39,498,607
CL&P |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,437,900 | 7,897,100
Transmission - Electric | 6,937,700 | 6,548,200
Solar | 0 | 0
Property, Plant and Equipment, Gross | 15,375,600 | 14,445,300
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,928,000) | (2,670,500)
Property, Plant and Equipment, Net | 12,447,600 | 11,774,800
Construction Work in Progress | 554,600 | 565,400
Total Property, Plant and Equipment, Net | 13,002,193 | 12,340,192
NSTAR Electric |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 9,782,300 | 9,000,500
Transmission - Electric | 6,375,200 | 5,630,800
Solar | 201,000 | 201,100
Property, Plant and Equipment, Gross | 16,358,500 | 14,832,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,782,000) | (3,585,900)
Property, Plant and Equipment, Net | 12,576,500 | 11,246,500
Construction Work in Progress | 1,461,300 | 1,507,300
Total Property, Plant and Equipment, Net | 14,037,828 | 12,753,787
PSNH |  |
Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,964,200 | 2,799,200
Transmission - Electric | 2,819,600 | 2,489,500
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,783,800 | 5,288,700
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (1,032,300) | (984,000)
Property, Plant and Equipment, Net | 4,751,500 | 4,304,700
Construction Work in Progress | 338,400 | 270,000
Total Property, Plant and Equipment, Net | $ 5,089,943 | $ 4,574,652

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