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REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 4,468,700 | $ 4,240,200
Less: Current Portion | 602,432 | 389,430
Total Long-Term Regulatory Liabilities | 3,866,251 | 3,850,781
EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,685,200 | 2,778,600
Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 649,600 | 624,800
Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 133,500 | 83,600
Regulatory Tracker Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 448,400 | 366,500
AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 81,000 | 76,800
CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 81,300 | 0
Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 389,700 | 309,900
The Connecticut Light and Power Company |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,459,800 | 1,342,100
Less: Current Portion | 266,489 | 137,166
Total Long-Term Regulatory Liabilities | 1,193,259 | 1,204,942
The Connecticut Light and Power Company | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 996,100 | 1,010,700
The Connecticut Light and Power Company | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 100,100 | 98,400
The Connecticut Light and Power Company | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
The Connecticut Light and Power Company | Regulatory Tracker Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 182,000 | 148,900
The Connecticut Light and Power Company | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 43,200 | 44,600
The Connecticut Light and Power Company | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 81,300 | 0
The Connecticut Light and Power Company | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 57,100 | 39,500
NSTAR Electric Company |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,787,300 | 1,715,200
Less: Current Portion | 228,248 | 164,761
Total Long-Term Regulatory Liabilities | 1,559,072 | 1,550,390
NSTAR Electric Company | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 984,500 | 1,044,000
NSTAR Electric Company | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 381,000 | 363,600
NSTAR Electric Company | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 107,400 | 72,500
NSTAR Electric Company | Regulatory Tracker Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 185,100 | 139,700
NSTAR Electric Company | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 37,800 | 32,200
NSTAR Electric Company | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
NSTAR Electric Company | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 91,500 | 63,200
Public Service Company of New Hampshire |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 501,600 | 442,000
Less: Current Portion | 120,176 | 58,756
Total Long-Term Regulatory Liabilities | 381,366 | 383,183
Public Service Company of New Hampshire | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 359,200 | 371,500
Public Service Company of New Hampshire | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 17,200 | 12,900
Public Service Company of New Hampshire | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
Public Service Company of New Hampshire | Regulatory Tracker Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 107,000 | 47,800
Public Service Company of New Hampshire | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
Public Service Company of New Hampshire | CL&P Settlement Agreement and Storm Performance Penalty |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
Public Service Company of New Hampshire | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 18,200 | $ 9,800

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