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REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 4,547,200 | $ 4,468,700
Less: Current Portion | 652,358 | 602,432
Total Long-Term Regulatory Liabilities | 3,894,768 | 3,866,251
EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,665,700 | 2,685,200
Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 667,200 | 649,600
Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 571,800 | 448,400
Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 128,300 | 133,500
AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 85,100 | 81,000
CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 12,900 | 81,300
Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 416,200 | 389,700
CL&P |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,459,900 | 1,459,800
Less: Current Portion | 251,555 | 266,489
Total Long-Term Regulatory Liabilities | 1,208,297 | 1,193,259
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 992,700 | 996,100
CL&P | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 108,600 | 100,100
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 226,700 | 182,000
CL&P | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
CL&P | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 44,000 | 43,200
CL&P | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 12,900 | 81,300
CL&P | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 75,000 | 57,100
NSTAR Electric |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,850,300 | 1,787,300
Less: Current Portion | 279,299 | 228,248
Total Long-Term Regulatory Liabilities | 1,570,969 | 1,559,072
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 973,300 | 984,500
NSTAR Electric | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 388,200 | 381,000
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 237,200 | 185,100
NSTAR Electric | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 103,100 | 107,400
NSTAR Electric | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 41,100 | 37,800
NSTAR Electric | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
NSTAR Electric | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 107,400 | 91,500
PSNH |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 495,200 | 501,600
Less: Current Portion | 106,393 | 120,176
Total Long-Term Regulatory Liabilities | 388,838 | 381,366
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 356,100 | 359,200
PSNH | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 19,100 | 17,200
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 94,900 | 107,000
PSNH | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 25,100 | $ 18,200

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