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Supplemental Cash Flow Information (Tables)
3 Months Ended
Jun. 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 June 30, 2015 As of June 30, 2014
Eversource$142.3 $125.5
CL&P 47.2  54.0
NSTAR Electric 29.5  21.6
PSNH 25.6  14.8
WMECO 13.7  9.9