Gas

Gaz Métropolitain Inc. (SCGM) is the major natural gas distributor in Québec. (the Company owns a thermal power plant and a steam distribution network in downtown Montreal.)

You can also consult http://www.transcanada.com/
(TransCanada Pipelines Limited is an energy company and carrier of natural gas in North America. TransCanada operates via British Columbia)

Electricity

Electricity is provided by Hydro Quebec. That's what people are referring to when they talk about "Hydro" here in Montreal. For further information, consult http://www.hydroquebec.com/en/index.html