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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 2,227,277 | $ 2,176,080
Offshore Wind Business - North East Offshore |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 50.00% |
Investments in unconsolidated affiliates | $ 2,083,100 | 1,947,100
Natural Gas Pipeline - Algonquin Gas Transmission, LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 15.00% |
Investments in unconsolidated affiliates | $ 116,400 | 118,800
Renewable Energy Investment Fund |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest (percent) | 90.00% |
Investments in unconsolidated affiliates | $ 0 | 84,100
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 27,800 | $ 26,100

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