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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Corporate Information And Statement Of IFRS Compliance [Abstract] |
Disclosure of estimated useful lives of property, plant and equipment | Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows:
Buildings |  | Up to 75 years
Transmission stations, towers and related fixtures |  | Up to 40 years
Leasehold improvements |  | Up to 50 years
Plant and equipment |  | Up to 40 years
Network systems |  | Up to 65 years
Track |  | Up to 40 years
District energy systems |  | Up to 50 years
Gas storage assets |  | Up to 50 years

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