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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) $ in Millions | Jan. 24, 2025 USD ($) | Dec. 31, 2024 USD ($) letterOfCredit | Sep. 30, 2024 USD ($) | Jul. 09, 2024 | Jan. 24, 2024 | Dec. 31, 2023 USD ($)
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Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum exposure guarantee |  | $ 1.2 |  |  |  | $ 4.4
Maximum Exposure |  |  | $ 850.0 |  |  |
Eversource Investment LLC | Letter of Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 5.3 |  |  |  |
Amount of long-term debt requested for issuance |  | $ 25.0 |  |  |  |
Revolution Wind |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Number of letter of credit | letterOfCredit |  | 1 |  |  |  |
Revolution Wind | Letter of Credit | Subsequent Event |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Borrowings outstanding | $ 1.0 |  |  |  |  |
South Fork Wind, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Number of letter of credit | letterOfCredit |  | 2 |  |  |  |
Sunrise Wind, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Ownership interest (in percent) |  |  |  | 50.00% | 50.00% |
South Fork Wind, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | $ 7.1 |  |  |  |
Ownership interest (in percent) |  | 50.00% |  |  |  | 50.00%
South Fork Class B Member, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Ownership interest (in percent) |  | 50.00% |  |  |  |
North East Offshore, Revolution Wind, LLC and South Fork Wind, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Ownership interest (in percent) |  | 50.00% |  |  |  |
Eversource Investment Services Company LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  | $ 100.0 |  |  |
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | $ 1,620.0 |  |  |  |
Tax Equity | Eversource TEI LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 50.0 |  |  |  |
Revolution Wind, LLC and TurbineCo, LLC | Offshore wind construction-related purchase agreements with third-party contractors |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 357.0 |  |  |  |
Revolution Wind, LLC and TurbineCo, LLC | Performance Guarantee |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 935.6 |  |  |  |
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC | Funding and Indemnification Obligations |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 277.5 |  |  |  |
Eversource Investment LLC | Letters of Credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 5.3 |  |  |  |
Eversource TEI LLC | South Fork Wind Tax Equity |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 50.0 |  |  |  |
South Fork Wind, LLC | Power Purchase Agreement Security |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | 7.1 |  |  |  |
Various Eversource subsidiaries | Surety Bonds |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  | $ 30.7 |  |  |  |

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