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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jan. 31, 2022 USD ($) letterOfCredit | Sep. 16, 2020 USD ($)
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Guarantor Obligations [Line Items] |  |  |  |
Number of letters of credit | letterOfCredit |  |  | 2 |
Letters of Credit | Eversource Investment LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Long-term debt and long term borrowing limit approved by regulatory agency |  |  |  | $ 25.0
North East Offshore |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Ownership interest (percent) | 50.00% |  |  |
Sunrise Wind LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 1,060.0 |  |  |
Ownership interest (percent) | 50.00% |  |  |
Revolution Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 546.4 |  |  |
Ownership interest (percent) | 50.00% |  |  |
South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 7.1 |  |  |
Ownership interest (percent) | 50.00% |  |  |
Eversource Investment LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 110.0 |  |  |
South Fork Class B Member, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 499.5 |  |  |
Ownership interest (percent) | 50.00% |  |  |
Sunrise Wind LLC | Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Amount outstanding under line of credit |  | $ 9.9 |  |
Revolution Wind, LLC | Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Amount outstanding under line of credit | $ 1.0 |  |  |
South Fork Wind, LLC | Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Amount outstanding under line of credit |  |  | $ 4.3 |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 161.0 |  |  |
Ownership interest (percent) | 50.00% |  |  |
Construction-related purchase agreements with third-party contractors | North East Offshore |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 705.8 |  |  |
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 823.3 |  |  |
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 381.1 |  |  |
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 55.5 |  |  |
Indemnification Agreement | Eversource Investment LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 29.8 |  |  |
Indemnification Agreement | Eversource Investment LLC | North East Offshore |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 910.0 |  |  |
Indemnification Agreement | Eversource Investment LLC | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 77.4 |  |  |
Indemnification Agreement | South Fork Class B Member, LLC | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 77.4 |  |  |
Power Purchase Agreement | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 7.1 |  |  |
OREC capacity production | Sunrise Wind LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 15.4 |  |  |
Ownership interest (percent) | 50.00% |  |  |
OREC capacity production | Sunrise Wind LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 11.0 |  |  |
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 |  |  |
Letters of Credit | Eversource Investment LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 15.2 |  |  |
South Fork Wind Tax Equity | Eversource TEI LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 528.4 |  |  |
South Fork Wind Tax Equity | Eversource TEI LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 0.0 |  |  |
Surety bonds | Various |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 38.8 |  |  |
Lease payments for real estate | Eversource Service |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | 0.3 |  |  |
Performance guarantee | North East Offshore |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 1,300.0 |  |  |
Percent of obligations guaranteed (in percent) | 50.00% |  |  |
Payment guarantee | North East Offshore |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum exposure (up to) | $ 62.5 |  |  |
Percent of obligations guaranteed (in percent) | 50.00% |  |  |

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