How to Read Your Ontario Electricity Bill

When your electricity bill suddenly goes up, you might start looking around your home for answers. Sometimes the reason is clear, like a cold snap, an air conditioner working overtime, or charging your EV more often. But other times, everything seems normal, and the higher bill is hard to explain.

Often, the real reason is hidden in the details of your bill. Maybe this billing cycle covers more days than the last one, or a recent actual meter reading is correcting a previous estimate. Delivery fees, regulatory charges, taxes, or an unpaid balance from last month can also increase your total, even if your energy use stayed about the same.

To find out what changed, compare your latest bill to the previous one. Look at the billing dates, total kWh, and the meter reading type. These details often explain more than just checking the final amount. If you still have questions, go through your bill line by line to see where the extra costs are.

Did you know? Many Ontarians call their electricity bill a “hydro bill.” The term comes from the province’s long history with hydroelectric power, but today it refers more broadly to the bill for electricity delivered to your home or business.

Before you worry about a high bill, check how many days are included. A 35-day billing cycle means a whole extra week of power compared to a 28-day cycle. That extra week can raise your total, even if you used less energy each day.

Here’s a simple way to compare: divide your total kWh by the number of billing days to get your daily average. For example, 700 kWh over 28 days is 25 kWh per day. If you used 770 kWh over 35 days, that’s only 22 kWh per day. Even if the second bill is higher, your home was actually more efficient.

If the billing dates don’t explain the higher bill, check the meter-reading type. An ‘actual’ reading comes from your meter, while an ‘estimated’ reading is just the utility’s guess. When the company updates a series of estimates with an actual reading, your bill may be adjusted to catch up. This can make your new total much higher or lower, even if your routine stayed the same.

After you understand the dates and meter reading, go through your electricity bill line by line. Not every charge will drop just because you used less electricity.

Kilowatt-hours measure how electricity consumption adds up over time. One kWh equals 1,000 watts used for one hour. 

The formula is: 

kWh = watts × hours used ÷ 1,000 

As an example, a 1,500-watt space heater running for two hours uses about 3 kWh. Run it for two hours every night for a week, and it adds about 21 kWh. 

The Electricity line combines the kWh billed with the rate for your account. Customers with an electricity retailer contract pay the rate shown in their agreement rather than the Ontario Energy Board-regulated price.

The ‘Delivery’ charge often surprises people. You might think that using less electricity means every charge on your bill will go down, but delivery charges are different. This fee has two parts: one that changes with your usage, and another fixed cost that keeps your home connected to the grid. 

Think of it as the cost of maintaining the power network. This charge pays for everything needed to keep the system running safely, including poles, wires, transformers, customer service, digital meters, and round-the-clock maintenance. 

Since local systems are different across Ontario, delivery rates vary as well. Two homes in different towns might use the same amount of electricity but have very different delivery charges, just because their utilities have different costs and infrastructure.

If you want to see more details about fixed fees and usage costs, take a look at our simple breakdown of Ontario electricity delivery charges to find out where your money goes. 

Did you know? Utilities use delivery revenue for services and infrastructure such as metering, billing, customer service, transmission lines, local distribution systems, poles, transformers, maintenance, and line loss.

Your bill isn’t just a running tally of costs; it also includes automatic savings. If you are an eligible residential customer, small business, or farm, you will automatically see the Ontario Electricity Rebate show up as a 23.5% pre-tax credit directly on your bill. On top of that, if your household is approved for the Ontario Electricity Support Program, you will see an additional credit applied to your statement each month.

Next comes Ontario’s 13% Harmonized Sales Tax (HST). There is actually some good news about how this tax is calculated: the utility company applies your 23.5% rebate before calculating the tax. Because that credit drops your taxable subtotal first, it automatically shrinks the amount of HST you owe.

Finally, check your account summary at the bottom of the bill. Past balances, late fees, recent payments, or equal-billing adjustments can change your final total. If a number seems too high, it might be a leftover charge or correction from last month, not your current energy use.

In Ontario, you don’t have to stick with just one rate. Most customers can choose from three pricing options: Time-of-Use (TOU), Ultra-Low Overnight (ULO), or Tiered pricing. Each plan handles your electricity use differently, so your daily habits can make your bill vary widely, even if your total usage stays the same.

With TOU pricing, when you pull power from the grid matters just as much as how much you use. Weekdays are split into off-peak, mid-peak, and on-peak hours, while weekends and holidays stay at the cheapest off-peak rate all day.

Ontario changes this weekday schedule twice a year: summer hours begin on May 1, and winter hours start on November 1. Because of this, your bill can go up after a seasonal change, even if your routine stays the same. TOU plans affect big energy uses the most, like running the dishwasher, doing laundry, using the AC, or charging your EV.

View a sample TOU bill.

If you stay up late or have a regular evening routine, ULO gives you a much bigger difference in prices. You get a large discount every night from 11 p.m. to 7 a.m. However, using power on weekdays between 4 p.m. and 9 p.m. will cost you the most.

If you charge an EV overnight, this plan can fit your routine well. But if your family uses a lot of power during peak dinner hours for cooking, laundry, or cooling, the high evening rate could cancel out your overnight savings.

View a sample ULO bill.

If you don’t want to worry about the time of day, Tiered pricing ignores when you use electricity. Running your dryer at noon costs the same as running it at midnight, as long as you stay within your monthly usage limit.

Residential customers get a lower rate for the first 600 kWh each month in the summer, and 1,000 kWh in the winter. Small businesses have a 750-kWh limit all year. If you use more than these amounts, any extra power is charged at a higher rate. This plan is simple and easy to manage, but how much you save depends on your monthly energy use.

View a sample Tiered bill.

If you are billed directly by your utility provider under the Regulated Price Plan, switching is easy. You just need to submit an election form, and your provider will handle it from there. However, if your bill comes from a unit sub-meter provider, your options may be more limited; check with your building’s billing provider first.

Before you switch plans, don’t just look at one spring or fall bill. Collect a few months of bills to see your real habits. Then, use the Ontario Energy Board’s online bill calculator. Enter your actual usage, and the tool will show you how your delivery fees, charges, and credits compare under each plan.

If your bill is higher than you expected, don’t worry. Compare your current statement with the previous one and follow this quick five-step checklist:

1. Check the calendar: Compare the number of billing days and your average daily kWh.
2. Verify the reading type: See if the bill says ‘actual’ or ‘estimated’.
3. Isolate the energy cost by reviewing the specific ‘Electricity’ line item.
4. Check any fees: Compare the delivery fees, regulatory charges, and applied credits.
5. Look at past history: Finish by reviewing your account summary for any lingering balances or adjustments.

Of all these items, you have the most control over the Electricity line. If you see a big increase there, check the main energy users in your home first, like heating and cooling systems, large appliances, and EV chargers. Always compare bills from the same season, and use your daily average kWh instead of the total if your billing cycles are different lengths.

If you use a TOU or ULO pricing plan, also pay attention to when you use flexible appliances. Lowering your total kWh will reduce some charges, but fixed delivery fees, local taxes, and past balances will not change.

Brought to you by justenergy.com

All images licensed from Adobe Stock.

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