As Ontario transitions from winter to summer, electricity pricing periods are set to change, directly affecting when power costs are highest and lowest during the day. These updates are part of the province’s time-of-use (TOU) pricing system, making it essential for households to adjust their energy usage habits to control bills effectively.
Beginning May 1, Ontario will officially adopt the summer TOU rate structure, along with revised electricity pricing. While the exact new rates are yet to be confirmed, the shift in timing alone will significantly influence daily energy costs.
Understanding the Time-of-Use Pricing System
Ontario’s TOU pricing operates on a yearly cycle from November 1, 2025, to October 31, 2026. During this period, electricity rates vary depending on the time of day, encouraging consumers to use energy during lower-cost hours.
This system is designed to balance electricity demand across the grid while helping households save money by shifting usage to cheaper periods.
Who Sets Electricity Rates in Ontario?
Electricity prices in Ontario are regulated by the Ontario Energy Board (OEB). This authority reviews and adjusts rates periodically based on factors such as:
- Energy supply levels
- Consumer demand
- Market conditions
These updates ensure pricing reflects real-time energy trends while maintaining system reliability.
Winter vs Summer Time-of-Use Schedule
The transition to summer pricing changes the timing of off-peak, mid-peak, and on-peak periods, which directly impacts electricity costs.
Estimated Time-of-Use Comparison
| Season | Off-Peak Hours | Mid-Peak Hours | On-Peak Hours |
|---|---|---|---|
| Winter (Nov 1 – Apr 30) | 7 PM – 7 AM | 11 AM – 5 PM | 7 AM – 11 AM, 5 PM – 7 PM |
| Summer (May 1 – Oct 31) | 7 PM – 7 AM | 7 AM – 11 AM, 5 PM – 7 PM | 11 AM – 5 PM |
Key Changes in Summer Electricity Pricing
With the arrival of summer, the most expensive electricity period shifts to midday (11 AM – 5 PM). This change reflects increased demand caused by cooling systems like air conditioners during warmer months.
In contrast:
- Off-peak hours remain unchanged (evenings and overnight)
- Mid-peak periods move to morning and early evening
How These Changes Affect Consumers
The updated schedule means that households using electricity heavily during midday could see higher energy costs. However, with careful planning, it’s possible to minimize expenses.
Practical Ways to Save on Electricity Bills
- Run appliances such as washing machines and dishwashers during off-peak hours
- Avoid heavy electricity usage during midday peak periods
- Use programmable thermostats to reduce cooling during expensive hours
- Shift charging of devices or electric vehicles to nighttime
By adjusting daily habits, consumers can take advantage of lower rates and reduce overall energy bills.
Why the Shift Matters
The seasonal adjustment in TOU pricing reflects how electricity demand changes throughout the year. During summer, cooling needs increase energy consumption during the day, while winter demand tends to peak in the morning and evening.
This pricing strategy helps:
- Reduce strain on the power grid
- Encourage efficient energy usage
- Maintain stable electricity supply
Conclusion
Ontario’s move to summer time-of-use electricity pricing starting May 1 brings an important shift in when electricity is most expensive. With peak pricing now concentrated during midday hours, households must adapt their energy usage patterns to avoid higher costs. By understanding the updated schedule and making simple adjustments, consumers can better manage their electricity bills while contributing to a more efficient energy system.
FAQs
When does the summer TOU schedule start in Ontario?
The summer time-of-use pricing begins on May 1 each year and runs until October 31.
Who regulates electricity prices in Ontario?
The Ontario Energy Board (OEB) is responsible for setting and reviewing electricity rates.
What is the cheapest time to use electricity?
Electricity is cheapest during off-peak hours, typically from 7 PM to 7 AM.