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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 21,785,500 | $ 21,144,100
Distribution - Natural Gas | 9,210,400 | 8,922,200
Transmission - Electric | 16,569,500 | 16,130,900
Solar | 206,300 | 201,000
Utility | 47,771,700 | 46,398,200
Other | 2,390,500 | 2,254,100
Property, Plant and Equipment, Gross | 50,162,200 | 48,652,300
Less: Accumulated Depreciation |  |
Utility | (9,926,900) | (9,636,500)
Other | (1,144,200) | (1,044,100)
Total Accumulated Depreciation | (11,071,100) | (10,680,600)
Property, Plant and Equipment, Net | 39,091,100 | 37,971,700
Construction Work in Progress | 3,212,300 | 3,014,900
Total Property, Plant and Equipment, Net | 42,303,414 | 40,986,578
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,653,100 | 8,437,900
Transmission - Electric | 7,062,700 | 6,937,700
Solar | 0 | 0
Property, Plant and Equipment, Gross | 15,715,800 | 15,375,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,011,700) | (2,928,000)
Property, Plant and Equipment, Net | 12,704,100 | 12,447,600
Construction Work in Progress | 561,900 | 554,600
Total Property, Plant and Equipment, Net | 13,265,994 | 13,002,193
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 10,104,500 | 9,782,300
Transmission - Electric | 6,536,500 | 6,375,200
Solar | 206,300 | 201,000
Property, Plant and Equipment, Gross | 16,847,300 | 16,358,500
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,891,000) | (3,782,000)
Property, Plant and Equipment, Net | 12,956,300 | 12,576,500
Construction Work in Progress | 1,682,500 | 1,461,300
Total Property, Plant and Equipment, Net | 14,638,823 | 14,037,828
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 3,068,200 | 2,964,200
Transmission - Electric | 2,971,900 | 2,819,600
Solar | 0 | 0
Property, Plant and Equipment, Gross | 6,040,100 | 5,783,800
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (1,054,900) | (1,032,300)
Property, Plant and Equipment, Net | 4,985,200 | 4,751,500
Construction Work in Progress | 321,800 | 338,400
Total Property, Plant and Equipment, Net | $ 5,307,012 | $ 5,089,943

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