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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Oct. 25, 2019
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North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest | 50.00% |
Sunrise Wind LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 464.7 |
Ownership interest | 50.00% |
Revolution Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 409.3 |
Ownership interest | 50.00% |
South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 207.1 |
Eversource Investment LLC | North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest | 50.00% |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Ownership interest | 50.00% |
Construction-related purchase agreements with third-party contractors | North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 889.9 |
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 353.9 |
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 353.8 |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 165.1 |
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 100.9 |
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC | North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 910.0 |
Power Purchase Agreement | South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 7.1 |
Ownership interest | 50.00% |
OREC capacity production | Sunrise Wind LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 2.2 | $ 15.4
Ownership interest | 50.00% |
Real estate purchase | Bay State Wind LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 2.5 |
Transmission interconnection | South Fork Wind, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 1.2 |
Letter of Credit | Eversource Investment LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 4.3 |
Surety bonds | Various |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 35.7 |
Lease payments for real estate | Eversource Service |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | 0.6 |
Performance guarantee | North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 1,300.0 |
Percent of obligations guaranteed | 50.00% |
Payment guarantee | North East Offshore LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure (up to) | $ 62.5 |
Percent of obligations guaranteed | 50.00% |

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