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DERIVATIVE INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Energy Generation Amounts The amount of energy generation for which we have hedged on a forward basis under agreements with various financial institutions as of March 31, 2018 is indicated in the following table (in millions):
Calendar Year
 
Hedged MWh
2018
 
2.2
2019
 
1.3
Total
 
3.5