TransEnergie

Hydro-Québec's electricity transmission system (also known as the Quebec interconnection) is an international power transmission system centred in Quebec, Canada. The system pioneered the use of very high voltage 735 kV alternating current (AC) power lines that link the population centers of Montreal and Quebec City to distant hydroelectric power stations like the Daniel-Johnson Dam and the James Bay Project in northwestern Quebec and the Churchill Falls Generating Station in Labrador.

The system contains more than 34,187 kilometres (21,243 mi) of lines and 530 electrical substations. It is managed by Hydro-Québec TransÉnergie, a division of the crown corporation Hydro-Québec and is part of the Northeast Power Coordinating Council. It has 15 interconnections with the systems in Ontario, New Brunswick and the Northeastern United States and 6,025 MW of interconnection import capacity and 7,974 MW of interconnection export capacity.

Major expansion of the network began with the commissioning of the 735 kV AC power line in November 1965, as there was a need for electricity transmission over vast distances from the north to southern Quebec.

Much of Quebec's population is served by a few 735 kV power lines. This contributed to the severity of the power outage following the North American ice storm of 1998. The extent and duration of this blackout has generated criticism of the transmission system, and there is controversy concerning the use of hydroelectric dams.

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