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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
12 Months Ended
Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]  
Summary of Investments Eversource's investments included the following:
 Investment Balance as of December 31,
(Millions of Dollars)Ownership Interest20212020
Offshore Wind Business - North East Offshore50 %$1,213.6 $887.1 
Natural Gas Pipeline - Algonquin Gas Transmission, LLC15 %121.9 125.2 
Renewable Energy Investment Fund90 %76.5 71.6 
Other various24.3 23.2 
Total Investments in Unconsolidated Affiliates$1,436.3 $1,107.1