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Long-Term Contractual Arrangements (Tables)
6 Months Ended
Jun. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Long-term Purchase Commitment [Table Text Block]
 July - December                  
(Millions of Dollars)2014 2015 2016 2017 2018 Thereafter Total
Renewable Energy                    
NSTAR Electric$43.6 $86.3 $93.7 $89.8 $53.3 $302.8 $669.5
WMECO  -   -  2.4  2.4  2.4  28.9  36.1