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.