[GioM]

I think the answer here is alternate capacity. Canada gets a relatively small portion (11%) of its energy from natural gas, with no province exceeding 21% (Alberta). On aggregate, most energy generated in Canada is renewable.

[goalieca]

Many of our homes are heated with gas furnaces and gas water heaters. Works well into -40. I never even thought got about it.

[Pxtl]

Yes, but realistically natural gas is the standard for home heating here in Ontario at least (and I assume most of Canada) and our gas infrastructure does just fine through winter.