I lived in Ontario for 18 years and found power to be quite expensive compared to the midwestern US state I lived in before and after.

I believe this is due to the concentrated population centers needing to subsidize the transmission to the least populated areas, and would guess this would have an impact on energy costs for data centers in Canada. But again, my experience is (mostly) limited to SW Ontario, where everything is fairly expensive.

Quebec has a larger grid and lower rates due to its abundant hydroelectricity.

Ontario's relatively high costs are from the supply mix which is about 50% nuclear, 30% hydro, 10% wind, 10% gas.

Residential kWh as delivered is currently (no pun intended) about 12 US cents which is a bit high if you're used to Midwestern or Alberta coal but those in California are probably envious.

Energy prices are cheaper in Canada as a whole than the US which is cheaper than Europe. While China it's still significantly cheaper that those since they invested in every sort of energy instead of fighting it.

The post above seems to point to Alberta as the best value prop.