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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 949,037 | $ 660,473
Offshore Wind Business |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 50.00% |
Investments in unconsolidated affiliates | $ 806,100 | 515,500
Offshore Wind Business | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 50.00% |
Offshore Wind Business | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 100.00% |
Natural Gas Pipeline - Algonquin Gas Transmission, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 15.00% |
Investments in unconsolidated affiliates | $ 113,200 | 116,000
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 29,700 | $ 29,000

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