The demand for electricity Thursday will be amongst most the province has seen in the winter in about five years.
And it a lot of it has to do with the cold weather.
But don't worry. There won't be as much strain on the system as in the summer - meaning you won't see as many blackouts. Ontario's Independent Electricity System Operator (IESO) underlines the demand in the summer, is due to everyone running air conditioners.
If you want to save some money, spokesperson Martina Holmsen recommends to change your usage to off-peak hours. She underlines the higher the demand, the more electricity costs.
Hydro One spokesperson Tiziana Baccega Rosa says with days being shorter and nights colder, you need to make sure you're not wasting energy. She says no matter how they heat their homes, check that your doors and windows are weather-proofed so no warm air escapes.
She also recommends swapping out your light-bulbs for a more energy-efficient model, to deal with the darker evenings.