Ultra-Low Overnight Rates

With the Ultra-Low Overnight (ULO) price plan, there are four price periods: On-peak, Mid-peak, Weekend Off-peak, and Ultra-Low Overnight. 

The ultra-low overnight period is between 11:00 p.m. to 7:00 a.m. every day, when demand for electricity is lowest on average, and there is a higher on-peak price for consumption between 4:00 p.m. to 9:00 p.m. on weekdays, when demand is usually higher.

The ULO price periods are the same all year round. With ULO pricing, you can help manage your electricity costs by shifting high usage activities, like electric vehicle charging, to lower price periods when possible. 

ULO rates are set by the Ontario Energy Board.

  • For Time-of-Use PricingTiered Pricing, and Ultra-Low Overnight Pricing, Alectra Utilities passes this cost through to you, without mark-up, and pays it directly to our suppliers.
  • Customers who have signed a contract with an energy retailer pay the price stated in their contract plus the Global Adjustment.


Green LightbulbResidential and Small Business customers can choose from three pricing options: Time-of-Use PricingTiered Pricing, or Ultra-Low Overnight Pricing.

You can find more information on how to Choose Your Rate Option to help you make an informed choice about which electricity price plan is right for you.


Current Rates - November 1, 2023 to October 31, 2024

The chart below shows the Ultra-Low Overnight rates effective November 1, 2023:

Ultra-Low Overnight RatesPricing
Blue Ultra-Low Overnight Peak Ultra-Low Overnight - 11 p.m. to 7 a.m. every day 2.8¢ per kilowatt hour
Green Ultra-Low Off-Peak Off-Peak - 7 a.m. to 11 p.m. weekends and holidays 8.7¢ per kilowatt hour
Yellow Ultra-Low Mid-Peak Mid-Peak - 7 a.m. to 4 p.m. and 9 p.m. to 11 p.m. weekdays

12.2¢ per kilowatt hour

Purple Ultra-Low Off-Peak On-Peak - 4 p.m. to 9 p.m. weekdays 28.6¢ per kilowatt hour

Previous Rates - May 1 to October 31, 2023

Ultra-Low Overnight RatesPricing
Blue Ultra-Low Overnight Peak Ultra-Low Overnight - 11 p.m. to 7 a.m. every day 2.4¢ per kilowatt hour
Green Ultra-Low Off-Peak Off-Peak - 7 a.m. to 11 p.m. weekends and holidays 7.4¢ per kilowatt hour
Yellow Ultra-Low Mid-Peak Mid-Peak - 7 a.m. to 4 p.m. and 9 p.m. to 11 p.m. weekdays

10.2¢ per kilowatt hour

Purple Ultra-Low Off-Peak On-Peak - 4 p.m. to 9 p.m. weekdays 24.0¢ per kilowatt hour

Find more historical electricity prices at the Ontario Energy Board.