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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) $ in Millions	Jan. 24, 2025 USD ($)	Dec. 31, 2024 USD ($) letterOfCredit	Sep. 30, 2024 USD ($)	Jul. 09, 2024	Jan. 24, 2024	Dec. 31, 2023 USD ($)
Guarantor Obligations [Line Items]
Maximum exposure guarantee		$ 1.2				$ 4.4
Maximum Exposure			$ 850.0
Eversource Investment LLC | Letter of Credit
Guarantor Obligations [Line Items]
Maximum Exposure		5.3
Amount of long-term debt requested for issuance		$ 25.0
Revolution Wind
Guarantor Obligations [Line Items]
Number of letter of credit | letterOfCredit		1
Revolution Wind | Letter of Credit | Subsequent Event
Guarantor Obligations [Line Items]
Borrowings outstanding	$ 1.0
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Number of letter of credit | letterOfCredit		2
Sunrise Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest (in percent)				50.00%	50.00%
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum Exposure		$ 7.1
Ownership interest (in percent)		50.00%				50.00%
South Fork Class B Member, LLC
Guarantor Obligations [Line Items]
Ownership interest (in percent)		50.00%
North East Offshore, Revolution Wind, LLC and South Fork Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest (in percent)		50.00%
Eversource Investment Services Company LLC
Guarantor Obligations [Line Items]
Maximum Exposure			$ 100.0
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC
Guarantor Obligations [Line Items]
Maximum Exposure		$ 1,620.0
Tax Equity | Eversource TEI LLC
Guarantor Obligations [Line Items]
Maximum Exposure		50.0
Revolution Wind, LLC and TurbineCo, LLC | Offshore wind construction-related purchase agreements with third-party contractors
Guarantor Obligations [Line Items]
Maximum Exposure		357.0
Revolution Wind, LLC and TurbineCo, LLC | Performance Guarantee
Guarantor Obligations [Line Items]
Maximum Exposure		935.6
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC | Funding and Indemnification Obligations
Guarantor Obligations [Line Items]
Maximum Exposure		277.5
Eversource Investment LLC | Letters of Credit
Guarantor Obligations [Line Items]
Maximum Exposure		5.3
Eversource TEI LLC | South Fork Wind Tax Equity
Guarantor Obligations [Line Items]
Maximum Exposure		50.0
South Fork Wind, LLC | Power Purchase Agreement Security
Guarantor Obligations [Line Items]
Maximum Exposure		7.1
Various Eversource subsidiaries | Surety Bonds
Guarantor Obligations [Line Items]
Maximum Exposure		$ 30.7

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No definition available.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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