The idea that Canada could just turn off the energy tap is not as simple as it might appear.

For one thing, there are deep stresses between Alberta, the big oil-producing province, and the Federal government, and the eastern half of the country generally (there is a strong sense in Alberta that it collectively has been, and is being, robbed by the eastern provinces). Alberta is governed by far-right ideologues with separatist leanings (think: MAGA north), and the feds feel they have to step gingerly when it comes to anything that could interfere with Alberta's oil revenue.

The other big factor, is that the pipeline that carries oil to central/eastern Canada, passes through the States, so is vulnerable to being shut down by the Americans.

And another thing: given the madness of King trump, and moreso, nearly half the populace of the USA, it would not be a good idea to hand him a pretext for a Special Military Operation, by, for example, cutting off the flow of hydro-electricity to the northern states ....