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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) letterOfCredit | Jan. 24, 2024 | Jan. 01, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum exposure guarantee |  |  |  | $ 4.4 | $ 4.2
Eversource Investment LLC | Letter of Credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 15.2 |
Amount of long-term debt requested for issuance |  |  |  | $ 25.0 |
Eversource Investment LLC | Letter of Credit | Subsequent Event |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure | $ 8.0 |  |  |  |
Letters of credit issued | letterOfCredit | 2 |  |  |  |
North East Offshore, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Ownership interest (in percent) |  |  |  | 50.00% |
Sunrise Wind LLC | Subsequent Event |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Ownership interest (in percent) |  | 50.00% |  |  |
South Fork Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | $ 7.1 |
Ownership interest (in percent) |  |  |  | 50.00% |
Eversource Investment LLC and South Fork Class B Member, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | $ 1,520.0 |
South Fork Class B Member, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Ownership interest (in percent) |  |  |  | 50.00% |
OREC Capacity Production | Sunrise Wind LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | $ 15.4 |
Ownership interest (in percent) |  |  |  | 50.00% |
Maximum exposure guarantee |  |  |  | $ 11.0 |
OREC Capacity Production | Sunrise Wind LLC | Subsequent Event |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum exposure guarantee |  |  | $ 15.4 |  |
Surety Bonds | Sunrise Wind LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 20.5 |
Tax Equity | Eversource TEI LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 528.4 |
North East Offshore, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Offshore wind construction-related purchase agreements with third-party contractors |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 1,941.1 |
North East Offshore, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Performance Guarantee |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 3,030.0 |
Eversource Investment LLC and South Fork Class B Member, LLC | Funding and Indemnification Obligations |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 485.9 |
Sunrise Wind LLC | OREC Capacity Production |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 11.0 |
Sunrise Wind LLC | Surety Bonds |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 20.5 |
South Fork Wind, LLC | Power Purchase Agreement Security |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 7.1 |
Eversource Investment LLC | Letters of Credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 15.2 |
Eversource TEI LLC | South Fork Wind Tax Equity |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 0.0 |
Various | Surety Bonds |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | 38.8 |
North East Offshore LLC | Payment Guarantee |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  |  | $ 62.5 |
Percent of obligations guaranteed |  |  |  | 50.00% |

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