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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 21,467,700 | $ 21,144,100
Distribution - Natural Gas | 9,131,900 | 8,922,200
Transmission - Electric | 16,303,500 | 16,130,900
Solar | 205,800 | 201,000
Utility | 47,108,900 | 46,398,200
Other | 2,305,800 | 2,254,100
Property, Plant and Equipment, Gross | 49,414,700 | 48,652,300
Less: Accumulated Depreciation |  |
Utility | (9,807,500) | (9,636,500)
Other | (1,093,900) | (1,044,100)
Total Accumulated Depreciation | (10,901,400) | (10,680,600)
Property, Plant and Equipment, Net | 38,513,300 | 37,971,700
Construction Work in Progress | 3,136,800 | 3,014,900
Total Property, Plant and Equipment, Net | 41,650,106 | 40,986,578
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,564,900 | 8,437,900
Transmission - Electric | 6,996,700 | 6,937,700
Solar | 0 | 0
Property, Plant and Equipment, Gross | 15,561,600 | 15,375,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,979,900) | (2,928,000)
Property, Plant and Equipment, Net | 12,581,700 | 12,447,600
Construction Work in Progress | 557,400 | 554,600
Total Property, Plant and Equipment, Net | 13,139,142 | 13,002,193
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 9,930,900 | 9,782,300
Transmission - Electric | 6,426,400 | 6,375,200
Solar | 205,800 | 201,000
Property, Plant and Equipment, Gross | 16,563,100 | 16,358,500
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,846,700) | (3,782,000)
Property, Plant and Equipment, Net | 12,716,400 | 12,576,500
Construction Work in Progress | 1,635,800 | 1,461,300
Total Property, Plant and Equipment, Net | 14,352,198 | 14,037,828
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 3,012,200 | 2,964,200
Transmission - Electric | 2,882,100 | 2,819,600
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,894,300 | 5,783,800
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (1,048,100) | (1,032,300)
Property, Plant and Equipment, Net | 4,846,200 | 4,751,500
Construction Work in Progress | 342,200 | 338,400
Total Property, Plant and Equipment, Net | $ 5,188,357 | $ 5,089,943

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