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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]      
Interest expense on uncertain tax positions $ 1,300,000 $ 300,000 $ 0
Accrued interest payable 1,700,000 400,000  
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Valuation allowance for tax credit and operating loss carryforward 558,200,000 104,100,000  
State and Local Jurisdiction | CL&P      
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance 23,500,000 17,300,000  
Eversource | State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance $ 27,300,000 $ 21,300,000