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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Oct. 23, 2019 | Jan. 25, 2017
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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) | $ 420.6 |  |
Ownership interest | 50.00% |  |
Revolution Wind, LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | $ 268.5 |  |
Ownership interest | 50.00% |  |
South Fork Wind, LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | $ 184.0 |  |
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) | $ 936.3 |  |
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | 330.6 |  |
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | 254.7 |  |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | 165.3 |  |
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | 107.8 |  |
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 |  | $ 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) | 35.0 |  |
Lease payments for real estate | Eversource Service |  |  |
Guarantor Obligations [Line Items] |  |  |
Maximum exposure (up to) | 0.7 |  |
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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