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Supplemental Cash Flow Information (Tables)
3 Months Ended
Sep. 30, 2015
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
G.  Supplemental Cash Flow Information
Non-cash investing activities include plant additions included in Accounts Payable as follows:
         
(Millions of Dollars)As of September 30, 2015 As of September 30, 2014
Eversource$160.7  128.9
CL&P 46.0  52.2
NSTAR Electric 31.2  18.1
PSNH 33.8  21.0
WMECO 15.5  10.0