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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) $ in Millions | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) letterOfCredit | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 16, 2020 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |
Exposure of guarantee |  |  | $ 4.2 | $ 7.3 |
Eversource Investment LLC | Letter of Credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 25.0
North East Offshore LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Ownership interest (in percent) |  |  | 50.00% |  |
Revolution Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 546.7 |  |
Ownership interest (in percent) |  |  | 50.00% |  |
South Fork Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 7.1 |  |
Ownership interest (in percent) |  |  | 50.00% |  |
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 465.8 |  |
Ownership interest (in percent) |  |  | 50.00% |  |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 207.7 |  |
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% |  |
Exposure of guarantee |  |  | $ 2.2 |  |
OREC Capacity Production | Sunrise Wind LLC | Subsequent Event |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Exposure of guarantee |  | $ 11.0 |  |  |
North East Offshore LLC | Construction-related purchase agreements with third-party contractors |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 717.6 |  |
North East Offshore LLC | Performance Guarantee |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 1,300.0 |  |
Percent of obligations guaranteed |  |  | 50.00% |  |
North East Offshore LLC | Payment Guarantee |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 62.5 |  |
Percent of obligations guaranteed |  |  | 50.00% |  |
Sunrise Wind LLC | Construction-related purchase agreements with third-party contractors |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 311.5 |  |
Sunrise Wind LLC | OREC Capacity Production |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 2.2 |  |
Revolution Wind, LLC | Construction-related purchase agreements with third-party contractors |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 419.1 |  |
South Fork Wind, LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Letters of credit issued | letterOfCredit | 2 |  |  |  |
South Fork Wind, LLC | Letter of Credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Line of credit outstanding | $ 4.3 |  |  |  |
South Fork Wind, LLC | Construction-related purchase agreements with third-party contractors |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 142.1 |  |
South Fork Wind, LLC | Power Purchase Agreement Security |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 7.1 |  |
South Fork Wind, LLC | Transmission interconnection |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 1.2 |  |
Eversource Investment LLC | North East Offshore LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Ownership interest (in percent) |  |  | 50.00% |  |
Eversource Investment LLC | Funding and Indemnification Obligations |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 77.0 |  |
Eversource Investment LLC | Funding and Indemnification Obligations | North East Offshore LLC |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 910.0 |  |
Eversource Investment LLC | Letters of Credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 4.3 |  |
Bay State Wind LLC | Real estate purchase |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 2.5 |  |
Various | Surety Bonds |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 35.7 |  |
Eversource Service | Lease payments for real estate |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 0.5 |  |

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