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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions | Sep. 30, 2021 USD ($)
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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) | $ 15.4
Ownership interest | 50.00%
South Fork Wind, LLC |
Guarantor Obligations [Line Items] |
Ownership interest | 50.00%
Eversource Investment LLC | North East Offshore 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) | $ 1,093.5
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 386.4
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 40.6
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 0.0
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
OREC capacity production | Sunrise Wind LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 2.2
Transmission interconnection | South Fork Wind, LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 1.2
Real estate purchase | Bay State Wind LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 2.5
Surety bonds | Various |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 67.5
Lease payments for real estate | Rocky River Realty Company and Eversource Service |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | 4.0
Performance guarantee | North East Offshore LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | $ 1,300.0
Percent of obligations guaranteed | 50.00%
Performance guarantee | South Fork Wind, LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | $ 14.8
Payment guarantee | North East Offshore LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | $ 62.5
Percent of obligations guaranteed | 50.00%
Payment guarantee | South Fork Wind, LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | $ 25.8
Construction-Related Purchase Guarantee | Sunrise Wind LLC |
Guarantor Obligations [Line Items] |
Maximum exposure (up to) | $ 420.6

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