Why is my hydro bill so high? Causes, checks and what to ask your utility

A sudden high hydro bill usually has one of five causes: more days in the billing period, more usage (cold weather, a new appliance, a fault such as a stuck heating element), a catch-up after estimated reads, a rate or rebate change (for example Ontario's rebate fell from 23.5% to 15.7% on 1 November 2026), or, much more rarely, a billing or meter error such as the wrong meter linked to your account. Start by comparing the kWh and the number of days with the same bill last year, then check the meter read type and meter number on the bill. If usage really jumped and you cannot explain it, ask the utility to verify the read and, if needed, to test the meter.

This guide belongs to our complaints hub.

Ten-minute diagnosis

Check	Where on the bill	What it tells you
Days in the period	Billing period dates	A 35-day bill costs more than a 28-day bill even at the same daily use
kWh (or GJ/m³) this period vs same period last year	Usage section or graph	Did usage really go up?
kWh per day	kWh ÷ days	Removes the period-length effect
Read type	"Actual" or "Estimated" next to the read	Estimated reads may have been too low before
Meter number	Meter details	Must match the meter at your unit
Prices and plan	Electricity line	Did your plan or contract change?
Rebates and credits	Bottom of bill	Did a rebate or credit drop?
One-time items	Adjustments, riders, fees	Any back-billing or correction?

Common causes in more detail

1. Estimated reads followed by an actual read

If the meter could not be read remotely for a few periods, the utility estimates. When an actual read comes in, the difference is billed all at once. The bill is not wrong, but it covers more consumption than it appears. Ask the utility to explain the catch-up and, if it is large, to spread it over several months.

2. Weather and heating

Electric baseboards, a heat pump on auxiliary heat strips, or a gas furnace running more in a cold snap can double winter usage. On tiered or block rates (Ontario tiered, BC Hydro tiered, Hydro-Québec Rate D) more of that use is billed at the higher price, so the bill rises faster than the kWh.

3. A fault or a new load

Typical culprits: a water heater element failing on, a sump pump cycling constantly, a block heater or space heater left on, a hot tub, a second fridge, an EV that started charging on a peak-priced schedule. Try the breaker test: with most loads off, watch the meter or your hourly data; switch breakers on one at a time to find what draws power. BC Hydro and other utilities publish guidance on this method.

4. Rates, plan or rebate changes

Ontario prices reset on 1 November 2026, and the Ontario Electricity Rebate fell to 15.7%, so a bill after 1 November can rise even if prices fell. See the rebate guide.
A retail contract adds Ontario's Global Adjustment.
An Alberta retail variable price can move monthly; gas commodity prices change monthly or quarterly.
A rate rider may have started or ended.

5. Billing or meter error

Rare but real: meters swapped between units in a duplex or new build, a meter multiplier error on certain installations, a transposed read, or charges for the wrong rate class. If the meter number on the bill does not match the one on your wall, tell the utility immediately.

Worked example: is it the price or the usage?

Illustrative Ontario tiered bills, same home:

	Last January	This January
Days	31	33
kWh	950	1,180
kWh/day	30.6	35.8
Energy	950 × 12.0¢ = $114.00	1,000 × 11.2¢ + 180 × 13.2¢ = $135.76

Per day, usage rose 17%. The energy price fell, but 180 kWh crossed the 1,000 kWh threshold into tier 2, and two extra days were billed. The rest of the increase comes from the lower rebate. Nothing is wrong with the bill; the cause is usage. The bill estimator helps you rebuild a bill like this.

What to ask your utility

"Was this bill based on an actual read? Were previous bills estimated?"
"Can you confirm the meter number linked to my account and where it is located?"
"Can you send me hourly or daily usage for this period?"
"Can the catch-up be spread over several bills?"
"Can you check the meter, and if needed arrange a meter test?"

Meter tests: meter accuracy in Canada is regulated federally by Measurement Canada. If you and the utility disagree about whether a meter is accurate, a dispute can be referred to Measurement Canada. There may be a fee if the meter is found accurate; ask first.

When it is a real error

Ask for a written correction. If the utility refuses or does not respond, escalate to your provincial regulator or mediator: see the complaints hub. If you have been billed for another unit's usage for months, ask for the full history to be corrected.

If you cannot pay the high bill

Call before the due date and ask for a payment arrangement. Look at low-income help and winter disconnection rules. An equal billing plan can smooth future winters.

FAQ

My neighbour's bill is lower. Is mine wrong?

Not necessarily. Heating type, insulation, occupants and habits vary. Compare your own history.

Can a utility back-bill me for an under-billing?

Utilities can usually correct under-billing within limits set in their rules or conditions of service; ask what period applies and for an arrangement to pay.

Does a smart meter make estimated reads impossible?

No. Communication failures still lead to estimates sometimes.

Should I switch plans after one high bill?

Only after checking 12 months of data. One cold month is not a pattern.

Sources

Ontario Energy Board — billing rules and complaints in Ontario
BC Hydro — high bill guidance and breaker test
Utilities Consumer Advocate — reading Alberta meters and bills
Hydro-Québec — understanding your bill
Innovation, Science and Economic Development Canada — Measurement Canada meter disputes