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Inventory (Tables)
12 Months Ended
Dec. 31, 2017
Inventory [Abstract]  
Schedule of Inventory, Current [Table Text Block]
13. INVENTORY
Inventory consisted of the following:
As atDecember 31December 31
millions of Canadian dollars 20172016
Fuel $ 180$ 235
Materials 216 215
Emission credits (1) 22 22
$ 418$ 472
(1)The NEGG Facilities are subject to the Acid Rain Program for sulphur dioxide emissions and the Regional Greenhouse Gas Initiative for carbon dioxide emissions. The emissions credits inventory balance represents the credits purchased to offset the other current liabilities and other long-term liabilities associated with these programs.