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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) - USD ($) $ in Millions | Jul. 09, 2024 | Jun. 30, 2024
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Eversource Investment LLC | Letters of Credit |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 23.2
Maximum borrowing capacity |  | $ 25.0
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest (percent) |  | 50.00%
Eversource Investment LLC and South Fork Class B Member, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 1,520.0
South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 7.1
Ownership interest (percent) |  | 50.00%
South Fork Class B Member, LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest (percent) |  | 50.00%
Tax Equity | Eversource TEI LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 50.0
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Construction-related purchase agreements with third-party contractors |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 1,418.1
North East Offshore, LLC, Sunrise Wind LLC, Revolution Wind, LLC and South Fork Wind, LLC | Performance Guarantee |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 2,830.0
Eversource Investment LLC and South Fork Class B Member, LLC | Funding and indemnification obligations of North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 333.9
Eversource Investment LLC | Letters Of Credit Guarantee |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 23.2
Eversource TEI LLC | South Fork Wind Tax Equity |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 50.0
South Fork Wind, LLC | Power Purchase Guarantee |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 7.1
Various Eversource subsidiaries | Surety Bond |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | 35.1
North East Offshore LLC | Payment Guarantee |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 62.5
Percent of obligations guaranteed (in percent) |  | 50.00%
Sunrise Wind, LLC | Subsequent Event |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 557.2 |
Sunrise Wind, LLC | Sunrise Wind, LLC | Letters of Credit | Subsequent Event |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 17.8 |
Orsted | Sunrise Wind, LLC | Subsequent Event |  |
Guarantor Obligations [Line Items] |  |
Ownership interest (percent) | 50.00% |
North East Offshore, LLC and Sunrise Wind, LLC | Funding and indemnification obligations of North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure |  | $ 598.6
North East Offshore, LLC and Sunrise Wind, LLC | Funding and indemnification obligations of North East Offshore LLC | Subsequent Event |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 1,200.0 |
TurbineCo, LLC and Sunrise Wind, LLC | Funding and indemnification obligations of North East Offshore LLC | Subsequent Event |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 523.8 |

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