Compared to many other household appliances, toaster ovens do not use a lot of electricity. In fact, they use roughly one-third the amount of power as a conventional electric oven. Each toaster oven is different, typically using between 800-1,500 watts per hour. A full convection toaster oven may use up to 1,800 watts. Electricity usage will also depend on the cooking temperature and time. You can do a few other things to further minimize energy consumption: choose a model with an Energy Star seal, unplug when not in use, and don’t try to bake anything that takes longer than 50 minutes to cook all the way through.