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 33,613 km of lines at various voltages. The division's fixed assets total $19.2 billion.

Voltage Substations (number) Lines (km)
765 kV and 735 kV 39 11,422
±450 kV DC 2 1,218
315 kV 67 5,409
230 kV 54 3,197
161 kV 43 2,125
120 kV 218 6,909
> 69 kV or less 93 3,333
Total 516 33,613
December 31, 2013

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 1,999
Ontario 1,970 2,735
New England 2,170 2,275
New-Brunswick 785 1,029
Newfoundland and Labrador 5,150 0
December 31, 2013

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