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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
 12 Months Ended
Dec. 31, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Summary of Investments Under the Equity Method Eversource's investments accounted for under the equity method include the following:
 Investment Balance as of December 31,
(Millions of Dollars)Ownership Interest20252024
Tax Equity Investment in South Fork Wind100%$19.1 $22.2 
Natural Gas Pipeline - Algonquin Gas Transmission, LLC15%110.8 112.6 
Other various36.3 33.9 
Total Investments in Unconsolidated Affiliates$166.2 $168.7