Could I add something to that?
The way the systems work, predominantly the northern provinces peak in the winter; their highest load level is experienced during the winter. Ad that's not the case in the United States, where the summer peaks are the highest.
So there's this load diversity between north and south, and that's why there is a lot of trade of electricity between Canada and the United States. Because you're normally in excess in the summer period in the northern places that aren't peaking. They do their maintenance and they still have excess power left over that can be sold to a market that is eagerly waiting for it, because that market is peaking, opposite to the north.