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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
12 Months Ended
Dec. 31, 2022
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 Interest20222021
Offshore Wind Business - North East Offshore50 %$1,947.1 $1,213.6 
Natural Gas Pipeline - Algonquin Gas Transmission, LLC15 %118.8 121.9 
Renewable Energy Investment Fund90 %84.1 76.5 
Other various26.1 24.3 
Total Investments in Unconsolidated Affiliates$2,176.1 $1,436.3