By and large, Canada is an exporter of electricity. There's an app on your phone called Gridwatch that will let you see real time in Ontario the locations of the different interconnections. It's exceptionally nerdy to follow.
You can see even in Ontario we might be exporting near Niagara Falls. We might be importing near Sault Ste. Marie. British Columbia by and large buys the most power into Canada. Again, Canada is still an exporter. It just happens that there is more hydro available at any given time in Washington state, and it flows into Canada. Electrons flow where they need to go.