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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)
 12 Months Ended
Dec. 31, 2019
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 Interest
 
2019
 
2018
Offshore Wind Business - North East Offshore and Bay State Wind
50
%
 
$
649.3

 
$
234.3

Natural Gas Pipeline - Algonquin Gas Transmission, LLC


15
%
 
127.8

 
155.0

Renewable Energy Investment Fund
90
%
 
72.4

 
54.1

Other
various

 
22.1

 
20.9

Total Investments in Unconsolidated Affiliates
 
 
$
871.6

 
$
464.3