What to do during a peak demand event

Dynamic pricing is designed to reduce electricity consumption in the winter during peak demand events by shifting consumption to another time of the day. You therefore need to change your habits during peak demand events.


Electric heating and hot water consumption make a big difference to your electricity bill. If you adopt good habits during peak demand events, you’ll save more.

Electric heating

Potential savings: very high

How to save: When you lower the temperature setting, your heating system turns off. The lower you set the temperature, the longer it stays off.

Understanding how lowering the temperature setting affects electricity use

Electric heating: A significant portion of the electricity used on cold days

On cold days, heating can represent up to 80% of your electricity consumption, so it’s important to follow Hydro-Québec’s heating tips to reduce your consumption during peak demand events and maximize your savings.

Things you can do

If you do it before, or the day before, your heating system will turn on again before or during the event. You either won’t save any money or you’ll save very little. Even if the temperature setting on the thermostat is lower, the system is still operating!

If you reset the thermostats to their usual temperature setting as soon as the peak demand event ends, you’ll be able to lower the temperature again if a second event occurs later in the day. That way, you’ll maximize your savings while maintaining a certain level of comfort.

If you lower just one or only a few thermostats, the other heaters are liable to compensate for the drop in heat, which may cancel out your efforts to use less electricity.

Do you usually turn down the temperature when your premises are unoccupied?

Don’t do it before a peak demand event because you’d then have to turn the temperature back up in the morning or evening, right in the middle of an event—and you should avoid doing that. But when there’s no peak demand event, carry on as usual.

Lowering the temperature by a few degrees at certain times is a good habit in terms of energy efficiency. But it’s not a good idea if you have shown interest in dynamic pricing, unless you are able to preheat your premises before a peak demand event.

Warning: If your heating system has trouble maintaining a normal room temperature (20°C to 21°C) in cold weather, this tip is not recommended for you. Keep in mind that the amount of time it takes to get back to the regular temperature after turning down the thermostat depends on how powerful your heating system is.

Hot water

Potential savings: average

Reduce the nonessential use of hot water by temporarily changing your habits, because heating water takes a lot of electricity. For more savings, postpone hot water use until after events.

Things you can do

The water heater is a tank that fills with cold water as the hot water is used up. If you use hot water the day before a peak demand event or after the event, you will postpone the energy consumption required to heat the water in the tank. During the event, the water heater will run off and on just to maintain the temperature setting.

A water heater can take up to two hours to heat a full tank. If you postpone hot water use after 8 p.m., the energy required to heat the water will be consumed after the event.

These tasks should be carried out with cold water to limit hot water consumption during peak demand events. If you limit your consumption, the water heater will only need to maintain the heat during the event.

Small changes that make a difference

Every step, whether big or small, you take to use less electricity during a peak demand event will lower your electricity bill.

Potential savings: low

  • Reduce or postpone the use of nonessential electrical devices.
  • Turn off or temporarily unplug all unnecessary electrical equipment and electronics (outdoor lighting, computers, etc.).

Potential savings: low

  • Be sure your air exchanger isn’t in exchange mode during peak demand events. Stopping the air exchange for a short time usually has little effect on indoor air quality.

Potential savings: average

  • Don’t recharge your electric vehicles during peak demand events. If your vehicles charged completely overnight, you don’t need to unplug it in the morning.
  • The amount of time and electricity needed to charge vehicles can vary a great deal, depending on the charger and the battery capacity. Some vehicles can be programmed to charge at a specific time, and some charging stations can be programmed to charge during a specific period. Plan to charge your electric vehicles outside of peak demand events whenever possible.

Greater comfort

Use a fuel-burning auxiliary heating system.

You can use your fuel-burning (oil, propane, natural gas or wood pellets) auxiliary heating system during peak demand events to stay comfortable while using less electricity.

Preheat your premises ahead of a peak demand event.

Turning up all the thermostats 1°C to 3°C about two hours before a peak demand event will keep you comfortable during the event. But don’t forget to set the temperature a few degrees lower than usual when the event starts, depending on how much electricity you want to save. Residual heat will keep the temperature pleasant during the event, even though you’ve lowered the thermostat.

This method will help you save money, because the price applicable to kWh consumed in the winter outside of peak demand events are considerably lower than the price applicable to kWh consumed during peak demand events, which is 51.967¢ per kWh.

Understanding how lowering the temperature setting affects electricity use

Tip: Some thermostat models have an “early on” option that lets you program the time you want to have the desired temperature, rather than the time the temperature should start to rise. In that way, your heating system will stop running before the event begins.


Should I get a smart thermostat?

Although they aren’t necessary, smart thermostats make it easier to control heating during peak demand events.

What happens when I lower the temperature setting?

Your heating system stops. The lower you set the temperature, the longer the heating will stay off and the more you’ll save.

Lowering the temperature setting can decrease your comfort slightly. If so, you can preheat your premises a few hours before the event. Your savings will be lower, but the temperature will be more comfortable.

Understanding how lowering the temperature setting affects electricity use

Can I program my thermostats to lower the set temperature between 6 a.m. and 9 a.m. and 4 p.m. and 8 p.m. every day in winter?

Yes, but you may sacrifice comfort outside peak demand events when electricity is billed at a lower rate. You may be able to program different schedules or periods, such as peak demand events in the mornings, evenings or both, for example. If your thermostats do not support this type of function or if you have difficulties programming them, adjust your thermostats manually at the start and end of each event.

If you are a Rate Flex G customer, you can program your thermostats to lower the temperature in different rooms (a garage or an empty room, for example) between 6 a.m. and 9 a.m. and 4 p.m. and 8 p.m. every day in winter. This will make things simpler during peak demand events, since you won’t have to manually adjust the set temperatures of your thermostats.

What happens when I use hot water?

The water heater is a tank that fills with cold water as the hot water is used up. As a result, your water heater elements have to work harder to heat the water. Since your water heater uses more energy to heat water in the tank than it does to maintain the temperature, you should delay your hot water consumption until the end of the peak demand event or after the event in order to maximize your savings.

A customized tool to track your results

You can track your results closely in your Customer Space.

There you’ll find the following information:

  • Information about the current winter, updated daily (total savings or increase, number of hours in peak demand events already gone by, number of days of the winter period elapsed)
  • Your energy use during peak demand events and outside events
  • Upcoming events for which you have received a notification
  • History of previous winters

Check out your Consumption Profile

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