Mickyc: In Ontario we have smart meters that track when you use the energy. It is half the price to use it in the evenings and weekends than during peak daytime hours. Weekday daytime hours are divided into 2 sections (depending on the season) and part of the day is mid-peak price and the other hours are peak price (double the evening and weekend cost).

I suck at doing the laundry during off peak hours.