With Time-of-Use (TOU) prices, Regulated Price Plan (RPP) customers pay prices that generally reflect the relative value of electricity supply at different times of the day.

There are three TOU periods – on-peak, mid-peak and off-peak. Prices are highest during on-peak, lower during mid-peak, and lowest during off-peak. TOU prices encourage households and small businesses to use electricity during lower-cost time periods.

TOU prices are set to be cheapest when demand is lower: during the evenings, on weekends, and on holidays. When demand is lower, most of the electricity we use comes from power sources such as nuclear generators and large hydroelectric stations. These sources, which are designed to run all of the time, are referred to as “baseload” power.

As daytime begins, more people and businesses turn on their lights, appliances, and devices. As the increased demand exhausts all available baseload power, the province turns to sources that generally cost more, such as natural gas-fired plants that can be called into action quickly to meet rising demand. Renewable sources, such as solar and wind, contribute to our supply needs when they are available.

TOU price periods are different in the summer (May 1 – October 31) than they are in the winter (November 1 – April 30).

The Ontario Energy Board (OEB) determines all price plans under RPP at the same time as it sets tiered rates. Ultra-Low Overnight (ULO) rates were first set for May 1, 2023.

The OEB sets RPP prices based on its forecast of the cost to supply households and small businesses over the next 12 months. The next rate adjustment is scheduled to take place November 1, 2023.

Your electricity bill includes the costs for the electricity that you use (billed at TOU rates), the services your local utility provides, and other costs of delivering electricity. Other charges may also appear on your bill related to your account.

Effective November 1, 2022, TOU customers are charged:

TOU Price PeriodsWinter (Nov. 1 to April 30)Summer (May 1 - Oct. 31)TOU Prices


Weekdays 7 p.m. to 7 a.m.
Weekends and holidays all day

Weekdays 7 p.m. to 7 a.m.
Weekends and holidays all day

7.4 ¢/kWh


Weekdays 11 a.m. to 5 p.m.

Weekdays 7 a.m. to 11 a.m. and 5 p.m. to 7 p.m.

10.2 ¢/kWh


Weekdays 7 a.m. to 11 a.m. and 5 p.m. to 7 p.m.

Weekdays 11 a.m. to 5 p.m.

15.1 ¢/kWh

Weekends and Holidays 

No matter which season, on weekends and holidays the cheapest rates are in effect all day. View the Holiday Schedule for Time-of-Use and Ultra-Low Overnight.

This means:

  • For TOU - Off-Peak
  • For ULO - Weekend Off-Peak and Ultra-Low Overnight

Note: If a holiday falls on a weekend, the next weekday (that is not also a holiday) will have the holiday prices in effect all day.

Easter Monday is not a holiday recognized by the OEB for the purposes of calculating electricity consumption at off-peak pricing, and therefore regular Time-of-Use prices apply on this day.

2023 Time-of-Use and Ultra-Low Overnight holiday schedule

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