Most houses in Canada are heated with natural gas. I'm not negating your overall comment, but in general, cold nights don't strain the grid because of heating needs.

Latest Data Shows the Rapid Growth of Heat Pumps in Canada - https://www.theenergymix.com/latest-data-shows-the-rapid-gro... - November 5th, 2025

(still good news, as most of Canada's electric generation is low carbon hydro, and the rest of fossil generation can be pushed out with storage and renewables, although I do not have a link handy by province how much fossil generation needs to be pushed out)