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Ontario hydro summer rate changes effective May 1 are once again shifting how and when you pay for electricity, and millions of households across the province will feel the impact immediately. As temperatures rise, so does electricity demand, and the new pricing structure reflects that seasonal shift.
If you rely on air conditioning, appliances, or work-from-home setups during the day, these Ontario hydro summer rate changes effective May 1 could directly affect your monthly bill.
What Are the Ontario Hydro Summer Rate Changes Effective May 1
Every year, Ontario switches between winter and summer electricity schedules. The Ontario hydro summer rate changes effective May 1 do not always mean new prices, but they do change when higher rates apply during the day.
Under the Time-of-Use system, electricity pricing depends on the time of day you consume power. The rates themselves are set annually, but the price periods shift twice a year, including on May 1.
This seasonal shift is designed to reflect real electricity demand patterns, especially as air conditioning usage increases during warmer months.
New Summer Time-of-Use Hours Starting May 1
The biggest impact of Ontario hydro summer rate changes effective May 1 is the shift in peak hours.
Summer Time-of-Use Schedule (May 1 to October 31)
- Off-Peak (cheapest):
Weekdays 7 p.m. to 7 a.m. + all weekend and holidays - Mid-Peak:
Weekdays 7 a.m. to 11 a.m. and 5 p.m. to 7 p.m. - On-Peak (most expensive):
Weekdays 11 a.m. to 5 p.m.
This is a major shift from winter, where the highest rates are typically in the morning and early evening.
Why Ontario Hydro Summer Rate Changes Effective May 1 Matter
The Ontario hydro summer rate changes effective May 1 are based on one key factor: electricity demand peaks in the afternoon during summer.
Air conditioners, cooling systems, and increased daytime usage push demand higher between late morning and late afternoon. That’s why on-peak pricing now applies during those hours.
This means:
- Running AC units during midday will cost more
- Daytime electricity usage becomes more expensive
- Evening and overnight usage remain the cheapest
Current Electricity Prices You Pay in 2026
Even though Ontario hydro summer rate changes effective May 1 mainly affect timing, the actual price levels remain based on the latest approved rates.
Typical Time-of-Use rates in 2026 include:
- Off-Peak: about 9.8¢ per kWh
- Mid-Peak: about 15.7¢ per kWh
- On-Peak: about 20.3¢ per kWh
These rates were set by the Ontario Energy Board and apply across most residential customers.
Other Pricing Plans Also Affected
Ontario hydro summer rate changes effective May 1 don’t just impact Time-of-Use customers.
Tiered Pricing
- Thresholds change seasonally
- More electricity is available at lower rates in winter than summer
Ultra-Low Overnight Plan
- Rates stay the same throughout the year
- Cheapest electricity is still overnight (around 3.9¢ per kWh)
This plan benefits households that can shift heavy usage to late-night hours.
Ontario Hydro Summer Rate Changes Effective May 1 and Your Monthly Bill
How much your bill changes depends on your usage habits.
You May Pay More If:
- You use air conditioning heavily during the day
- You run appliances between 11 a.m. and 5 p.m.
- You work from home with constant daytime energy use
You May Save If:
- You shift usage to evenings or weekends
- You run laundry, dishwashers, or EV charging overnight
- You reduce peak-hour consumption
Because of Ontario hydro summer rate changes effective May 1, timing is just as important as total electricity usage.
Smart Ways to Reduce Costs This Summer
With Ontario hydro summer rate changes effective May 1 now in place, managing your electricity habits can make a noticeable difference.
Shift Energy Use
Run high-energy appliances after 7 p.m. when rates drop.
Use Smart Thermostats
Adjust cooling schedules to reduce usage during peak hours.
Take Advantage of Weekends
Electricity is cheapest all day on weekends and holidays.
Consider Alternative Plans
Some households may benefit more from tiered or ultra-low overnight pricing depending on lifestyle.
The Ontario hydro summer rate changes effective May 1 are not just a routine update. They directly impact when electricity costs the most, especially during the hottest part of the day.
While the price per kilowatt-hour remains the same, the shift in peak hours means households need to be more strategic about when they use electricity.
Understanding these Ontario hydro summer rate changes effective May 1 can help you avoid higher bills and take full advantage of cheaper off-peak periods throughout the summer months.