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RELATED PARTY TRANSACTIONS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
RELATED PARTY TRANSACTIONS |  |  |
Service charges | CAD 332 | CAD 256 | CAD 222
Lease arrangement expenses | 151 | 21 | 0
Purchase of natural gas by wholly owned subsidiaries | 228 | 315 | 99
Sale of natural gas by wholly owned subsidiaries | 5 | 58 | 10
Amounts receivable from affiliates | 152 | 183 |
Vector Pipeline joint venture |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Service charges | 7 | 7 | CAD 6
Amounts receivable from affiliates | CAD 149 | 183 |
Vector Pipeline joint venture | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Annual interest rate on the loans (as a percent) | 4.00% |  |
Vector Pipeline joint venture | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Annual interest rate on the loans (as a percent) | 12.00% |  |
Other affiliates |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Amounts receivable from affiliates | CAD 3 | CAD 0 |

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