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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash as reported on the Balance Sheets | $ 33,381 | $ 53,873 |  |
Cash and Restricted Cash as reported on the Statements of Cash Flows | 132,633 | 166,418 | $ 177,992 | $ 521,752
Special Deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 66,400 | 81,500 |  |
Marketable Securities |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 16,300 | 13,700 |  |
Other Long-Term Assets |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 16,500 | 17,300 |  |
CL&P |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash as reported on the Balance Sheets | 0 | 10,213 |  |
Cash and Restricted Cash as reported on the Statements of Cash Flows | 1,068 | 12,243 | 24,128 | 20,327
CL&P | Special Deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 1,100 | 2,000 |  |
CL&P | Marketable Securities |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 0 | 0 |  |
CL&P | Other Long-Term Assets |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 0 | 0 |  |
NSTAR Electric |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash as reported on the Balance Sheets | 2,730 | 6,740 |  |
Cash and Restricted Cash as reported on the Statements of Cash Flows | 4,092 | 22,785 | 9,135 | 345,293
NSTAR Electric | Special Deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 1,400 | 16,100 |  |
NSTAR Electric | Marketable Securities |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 0 | 0 |  |
NSTAR Electric | Other Long-Term Assets |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 0 | 0 |  |
PSNH |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cash as reported on the Balance Sheets | 252 | 240 |  |
Cash and Restricted Cash as reported on the Statements of Cash Flows | 34,081 | 35,004 | $ 37,759 | $ 36,812
PSNH | Special Deposits |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 30,600 | 31,600 |  |
PSNH | Marketable Securities |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | 0 | 0 |  |
PSNH | Other Long-Term Assets |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Restricted cash | $ 3,200 | $ 3,200 |  |

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