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REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 4,745,100 | $ 4,614,700
Less: Current Portion | 652,291 | 591,750
Total Long-Term Regulatory Liabilities | 4,092,811 | 4,022,923
EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,526,700 | 2,548,600
Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 722,700 | 668,300
Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 717,400 | 666,600
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 391,500 | 354,000
AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 142,400 | 124,300
Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 40,400 | 51,000
Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 204,000 | 201,900
CL&P |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,485,200 | 1,418,100
Less: Current Portion | 133,305 | 102,239
Total Long-Term Regulatory Liabilities | 1,351,877 | 1,315,928
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 963,900 | 969,200
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 183,200 | 154,000
CL&P | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 182,100 | 157,900
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 56,000 | 49,900
CL&P | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 61,000 | 56,100
CL&P | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 500 | 600
CL&P | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 38,500 | 30,400
NSTAR Electric |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,033,100 | 1,953,400
Less: Current Portion | 413,492 | 368,070
Total Long-Term Regulatory Liabilities | 1,619,614 | 1,585,311
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 894,000 | 905,100
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 393,300 | 347,200
NSTAR Electric | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 442,200 | 420,900
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 194,000 | 175,900
NSTAR Electric | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 81,400 | 68,200
NSTAR Electric | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 14,700 | 22,200
NSTAR Electric | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 13,500 | 13,900
PSNH |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 471,300 | 511,100
Less: Current Portion | 79,112 | 117,515
Total Long-Term Regulatory Liabilities | 392,184 | 393,574
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 335,700 | 339,300
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 72,600 | 114,400
PSNH | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 18,400 | 16,200
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 39,700 | 36,600
PSNH | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 4,900 | $ 4,600

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