Transmission System Overview

Our system
Hydro-Québec TransÉnergie is a leader in transmission system design, operation and maintenance. Recognized the world over for the reliability of its grid, it spares no effort to stay at the forefront of the industry in this regard. Its transmission system is the most extensive in North America, comprising 516 substations and more than 33,639 km of lines at various voltages. The division's fixed assets total $19.1 billion.

Voltage Substations (number) Lines (km)
765 kV and 735 kV 38 11,422
±450 kV DC 2 1,218
315 kV 65 5,287
230 kV 53 3,188
161 kV 44 2,125
120 kV 218 6,926
> 69 kV or less 96 3,473
Total 516 33,639
December 31, 2012

Our interconnections
To offer customers a reliable system and transmission services tailored to their needs, Hydro-Québec TransÉnergie has multiple interconnections with systems in neighboring provinces and states. These facilities allow us to carry out interchanges with Newfoundland and Labrador, New Brunswick, Ontario and the U.S. Northeast.

Neighboring system Import mode (MW) Export mode (MW)
New York 1,100 2,000
Ontario 1,945 2,705
New England 2,170 2,260
New-Brunswick 785 1,029
Newfoundland and Labrador 5,150 0
December 31, 2012

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