Work out the Ontario Electricity Rebate on a bill's pre-tax subtotal at 15.7% from 1 November 2026, or at an earlier rate for an older bill.
The Ontario Electricity Rebate (OER) is a provincial credit shown on eligible electricity bills. From 1 November 2026 it is 15.7%, down from 23.5%, according to the rate change posted by Hydro One and other distributors. It is calculated on the pre-tax amount of the bill, which includes electricity, delivery and regulatory charges.
Formula: rebate = subtotal × rebate rate; subtotal after rebate = subtotal − rebate.
Worked example (illustrative): a $150 pre-tax subtotal × 15.7% = $23.55 rebate, leaving $126.45 before HST. The same subtotal at 23.5% would have earned $35.25, so the lower rebate costs about $11.70 on this bill even though RPP prices fell on 1 November 2026.
Bills that straddle 1 November: the rebate is prorated by days. Hydro One explains that days in September and October get 23.5% and days on or after 1 November get 15.7%. For a 61-day bill with 30 days before and 31 days after, a quick weighted rate is (30 × 23.5 + 31 × 15.7) ÷ 61 ≈ 19.5%.
Limits: the rebate applies to eligible accounts (residential, small business, farms and others using under 250,000 kWh a year, as distributors describe it). This tool does not compute HST. See the Ontario Electricity Rebate guide.
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Rates, Price Drivers and 2026 Rules
The Ontario Electricity Rebate is 15.7% of the pre-tax bill from 1 November 2026, down from 23.5%. Who gets it, how it is prorated and how to check it.
