Ohio · Updated August 28, 2026

Why is my Duke Energy bill so high?

Verified August 28, 2026. Source: PUCO Apples to Apples and Duke Energy Ohio tariff filings. Reviewed at the start of each month.

The short version

Your bill has two halves. One you cannot change, one you can.

Duke Energy is your utility. It will always deliver your power and always send your bill. But the supply half is open to competition, and most Ohio businesses have never switched — so they sit on the default rate, called the Standard Service Offer.

What changed in June 2026

The increase is tied to Duke's updated Standard Service Offer energy and capacity riders — costs connected to wholesale power and PJM capacity markets. Regional capacity prices hit records this cycle, largely because new data centers are pulling enormous load onto the grid. That cost lands on your bill whether you use more power or not.

What that gap costs a small business

The Price to Compare only covers the supply portion, so this is the part a switch actually moves.

These use the lowest advertised competitive rate. Your actual offer depends on your territory, your usage pattern and your contract length — which is exactly why the advertised number and your real number are rarely the same.

Is your bill on a demand charge?

If the supply rate does not explain the jump, look for a line measured in kilowatts rather than kilowatt-hours. Commercial accounts above roughly 10 kW are billed on peak demand — the highest short interval of the month — separately from everything they consumed.

One afternoon where the walk-in compressor kicks on at the same moment as the A/C can set a charge that follows you for the whole billing period. Cutting total usage does nothing for it; shifting when equipment starts does. And because demand charges sit on the delivery half of the bill, no supplier switch touches them — which makes establishing whether you have one the first thing worth doing.

The four Ohio utilities treat this differently. AEP Ohio exempts businesses under 10 kW through Schedule GS-1; AES Ohio bills every business from the first kilowatt; Ohio Edison charges a flat $19.6895 up to 5 kW and $7.5886 for each kW above. Knowing which applies to you decides whether shopping for supply is the right move at all.

Three other reasons your bill jumped

1. You rolled off a fixed contract

Fixed-rate supply contracts expire quietly. When yours does, you usually drop to a variable rate or back to the default — often at a much higher price, with no notice that reads like a warning.

2. A variable-rate supplier repriced you

If you signed with a competitive supplier on a variable plan, your rate can move every month. Introductory rates that beat the utility in month one frequently exceed it by month six.

3. Seasonal load you forgot about

Ohio summers and winters both push HVAC hard. A bill that looks alarming in August may simply be the same building working harder — worth ruling out before you assume you were overcharged.

When switching is the wrong move

If you are already on a fixed contract below 10.7¢, stay put — early termination fees usually run $50 to $200 and will erase a few months of savings. If your contract ends within 60 days, wait and switch at renewal instead. And if your bill spike came from a demand charge rather than the supply rate, changing suppliers will not fix it; the fix is operational.

How to check your own rate in five minutes

Pull out your most recent Duke Energy bill and find these three things:

1. 1.Your supply rate — usually printed as "Price to Compare" or listed under the supply or generation section, in cents per kWh
2. 2.Your supplier — if a company other than Duke appears, you already switched at some point; if not, you are on the default
3. 3.Your contract end date — if you have a supplier, this determines whether switching now costs you a fee

Then compare against current offers on Apples to Apples, the free comparison tool run by the Public Utilities Commission of Ohio. It lists every certified supplier licensed in your territory beside Duke's default rate.

Most private rate-comparison sites are paid by the suppliers they list. The order you see is often the order of who pays most, not who is cheapest for your usage. The PUCO tool is the neutral one — it is run by the state regulator and has nothing to sell you.