The vast majority of Ontario electricity users pay time-of-use prices. If you’ve signed an electricity contract with a company, these prices will not affect you. There are three time-of-use price periods:
- Off-peak, when demand for electricity is lowest. Ontario households use the majority of their electricity – nearly two thirds of it – during off-peak hours.
- Mid-peak, when demand for electricity is moderate. These periods are during the daytime, but not the busiest times of day.
- On-peak, when demand is highest. The busiest times of day. Generally when people are cooking, firing up their computers and running heaters or air conditioners.
Here's the link for more informations about the time-of-use price periods.