Quick answer: how to challenge a UK energy price increase

If your supplier has raised a guide price, check the actual electricity or gas unit rates and standing charges before disputing the change. A guide price is usually an estimated annual cost, not a separate Ofgem limit. It can rise because the supplier changed its rates, expected you to use more energy, or corrected an earlier estimate.

Take these steps:

1. Compare the old and new unit rates, standing charges, tariff terms, and meter readings.
2. Check whether you're on a fixed or variable tariff and whether the relevant rates are within the Ofgem price cap.
3. Send the supplier a written complaint with your calculations and supporting documents.
4. Ask for a corrected bill, refund, or account credit if you can show an error or overcharge.
5. If the complaint remains unresolved after eight weeks, or the supplier sends a deadlock letter sooner, refer it to the Energy Ombudsman.

Ofgem sets limits for covered default tariffs, but it doesn't normally decide individual billing disputes or award compensation. Your supplier is the first complaint route.

What a guide price means

Energy suppliers and comparison services may show an estimated annual cost in an email, tariff quotation, or online account. That figure is based on expected usage and may not match what you eventually pay.

The amount on your bill normally depends on:

• your electricity and gas usage in kilowatt-hours;
• the unit rate for each type of energy;
• the daily standing charge;
• your region, meter, and payment method;
• whether your meter readings are actual or estimated; and
• whether your tariff is fixed or variable.

A higher annual estimate doesn't automatically mean the supplier has overcharged you. The estimate may have been recalculated using higher expected consumption even though the unit rate stayed the same.

Use the Citizens Advice guidance on high energy bills to check other causes before treating the increase as a price error.

Which rules apply to the increase?

The Ofgem price cap

The Ofgem price cap limits the maximum unit rates and standing charges suppliers can charge on covered default tariffs for a particular period. Standard variable tariffs can move up or down as the cap changes. Ofgem sets the cap by period, and the level can vary by region, payment method, meter type, and fuel.

Check Ofgem's published price-cap information against the dates and rates on your bill. Don't compare only with a headline annual figure for a typical household.

The cap is not a limit on your total bill. If you use more energy, your bill can still increase while every rate remains within the cap. Suppliers can also charge less than the cap.

Fixed-term tariffs

A fixed tariff is governed mainly by the contract you agreed to. The latest cap change doesn't automatically prove that a fixed tariff has been changed incorrectly. Check:

• the tariff name and fixed-term dates;
• the unit rates and standing charges in your confirmation;
• any terms allowing a change;
• exit fees and renewal information; and
• the date the supplier says the new price took effect.

If a supplier has changed a fixed rate that appears to be protected by your contract, identify the exact term in your complaint.

Direct Debit changes

A higher Direct Debit is not necessarily the same thing as a higher tariff price. Suppliers may review payments because of usage, an account balance, or an updated forecast. Ask for the calculation and compare it with your actual readings.

Citizens Advice says a supplier shouldn't increase Direct Debit payments to cover energy used more than 12 months ago. If that appears to have happened, make it a separate point in your complaint.

Notice and communication

Keep the price-change notice, email, bill, or online message that first showed the increase. Your complaint can challenge unclear information, an incorrect effective date, or a rate that doesn't match the notice or contract. Ask the supplier to explain which tariff terms and dates it relied on rather than assuming that every increase is unlawful.

When is a guide price increase worth complaining about?

You have a stronger practical complaint if you can show one or more of these problems:

• the bill uses a different unit rate or standing charge from the rate you were given;
• a covered default tariff appears to exceed the applicable cap;
• the supplier applied the change before the date it gave you;
• the account was put on the wrong tariff;
• an estimated meter reading created an inflated bill;
• the annual guide figure changed without a clear explanation of the usage assumption;
• a Direct Debit was increased without a reasonable account or forecast explanation; or
• the supplier failed to make an agreed accessibility or communication adjustment.

A price that is higher than last quarter's price, or higher than a competitor's price, isn't by itself proof of an error. A cap-compliant supplier doesn't have to match another supplier's rates.

Prepare your evidence before contacting the supplier

Create one folder for the complaint and save PDFs or screenshots rather than relying on an online account that may later change. Include:

• the bill showing the disputed charge;
• the previous bill or tariff confirmation;
• the price-change notice and the date you received it;
• photographs of meter readings, with dates;
• smart-meter readings or downloadable usage data;
• your tariff terms and renewal information;
• Direct Debit notices and account-balance statements;
• a short timeline of calls, emails, and reference numbers; and
• your calculation of the amount you believe is wrong.

For a rate dispute, a simple calculation is often enough:

(correct unit rate - charged unit rate) x usage + standing-charge difference

Apply the calculation only to the disputed dates and meter type. If your bill covers both old and new rates, separate the periods instead of applying one rate to the whole bill.

How to make the formal complaint

Use the complaints email address, online form, or postal address in your supplier's complaints procedure. A sales chat or general enquiry may not be logged as a formal complaint, so write formal complaint in the subject line and first paragraph.

Explain:

1. what the supplier called the increase;
2. when you first saw or received it;
3. the old and new rates or charges;
4. why the figure appears wrong;
5. the amount you calculate is disputed; and
6. the outcome you want.

Ask for a written explanation, a corrected bill, and a refund or account credit if the evidence supports one. If the increase is affordable but the payment schedule is the problem, ask the supplier to review your Direct Debit separately.

The Citizens Advice complaint guidance recommends keeping records of calls and using the supplier's written complaints route.

Complaint email template

Subject: Formal complaint about energy price increase - account [number]

Dear [supplier complaints team],

I am making a formal complaint about the price shown on my account or bill dated [date].

My tariff is [tariff name], and I understand it is [fixed/variable]. The relevant details are:

- Electricity unit rate: [old rate] to [new rate] p/kWh
- Gas unit rate: [old rate] to [new rate] p/kWh
- Standing charge: [old amount] to [new amount] per day
- Change effective from: [date]
- Meter reading and date: [reading] on [date]
- Amount I believe is disputed: GBP [amount]

The figure appears incorrect because [explain the mismatch, incorrect reading,
wrong tariff, cap concern, or unclear notice]. I have attached [list documents].

Please:

1. confirm which tariff terms and price-change notice you relied on;
2. check the rates, dates, and meter readings on my account;
3. correct the bill and refund or credit any amount charged in error;
4. explain and review my Direct Debit if it was changed; and
5. send your written decision.

Please log this as a formal complaint and provide the complaint reference number.
If you cannot resolve it, please explain your final position and provide a
deadlock letter when appropriate.

Yours sincerely,

[Name]
[Address]
[Account number]
[Phone or email]

What happens after you complain?

Keep a dated record of every response. If you phone the supplier, note the time, name of the adviser, promises made, and any reference number. Follow up important promises by email.

The supplier should issue a decision or deadlock letter within eight weeks of the complaint being made. A deadlock letter may arrive earlier. It means the supplier has reached its final position; it isn't the same as an automated message saying someone will investigate.

While the complaint is open, keep paying bills or amounts you accept where you can. If you believe the whole bill is wrong, tell the supplier what part you dispute and ask how it wants the undisputed amount handled. Stopping all payments without an agreed arrangement can create a separate debt problem.

Escalating to the Energy Ombudsman

You can usually refer an energy complaint to the Energy Ombudsman when either:

• the supplier has sent a deadlock or final-response letter; or
• eight weeks have passed since you made the formal complaint.

The service is free to consumers. Check the ombudsman's current acceptance rules and the date on your letter; referrals are generally expected within 12 months of the deadlock letter or final response.

Prepare a short evidence pack containing:

• a one-page chronology;
• your original complaint;
• the supplier's decision or deadlock letter;
• bills, tariff documents, and meter evidence;
• your calculation of the disputed amount; and
• the outcome you want.

Ask for a specific remedy, such as recalculation using actual readings, correction of the tariff, a refund or credit for a proven overcharge, or a written explanation. You can also describe inconvenience or poor complaint handling, but don't assume a fixed goodwill payment or a particular compensation amount.

If the supplier has not sent a letter after eight weeks, explain that clearly in the referral and attach evidence of when the formal complaint began.

What Ofgem can and can't do

Ofgem is the regulator responsible for the energy market and price cap. It can use reports about possible wider supplier rule breaches, but the normal route for correcting your account is:

1. complain to the supplier;
2. refer the unresolved dispute to the Energy Ombudsman; and
3. report a possible systemic regulatory issue to Ofgem if appropriate.

Contacting Ofgem doesn't replace the supplier complaint or extend an ombudsman deadline. Save the supplier's evidence and continue with the relevant dispute route.

If the disputed guide price came from an energy broker or comparison service rather than the supplier, complain to that business separately. Check its complaints policy and the ombudsman named there, because a broker dispute may follow a different route from an energy-supplier complaint.

If the supplier rejects your complaint

Read the rejection carefully and identify whether it rejected:

• the rate calculation;
• the meter reading;
• the tariff interpretation;
• the requested refund; or
• the complaint-handling problem.

Reply once with any missing evidence and state what remains unresolved. If the supplier accepts part of the complaint, confirm in writing which points are still disputed.

You don't need to prove that the entire tariff is unfair. A narrow, documented error is easier to assess than a general claim that the supplier's prices are excessive. If the response doesn't resolve the issue, use the deadlock or eight-week route rather than repeatedly restarting the same complaint.

Should you switch suppliers?

Switching can reduce future costs, but it won't erase a dispute with your former supplier. Before switching:

• record meter readings on the switch date;
• download bills and account messages;
• check fixed-term exit fees;
• note any credit or debt on the old account;
• keep the old complaint reference; and
• compare unit rates, standing charges, and tariff terms, not just the annual guide price.

The old supplier should still deal with a billing complaint and issue a final account. Tell both suppliers about any meter-reading disagreement at the handover date.

If the price is correct but unaffordable, ask your current supplier about payment arrangements, affordability support, and the Priority Services Register. A supplier may be able to offer help even when there has been no billing error.

Common questions

Is an annual guide price covered by the Ofgem price cap?

No. The cap applies to specified rates and standing charges on covered tariffs. An annual guide price is an estimate based on usage and other assumptions. Check the rates and charges behind it.

Can a standard variable tariff increase every quarter?

It can move up or down as the applicable price-cap period changes, provided the supplier follows the relevant rules. Check the effective date and the rates for your region, meter, and payment method.

Can I complain if the new rates are below the cap?

Yes. You can challenge an incorrect bill, wrong tariff, inaccurate meter reading, unclear notice, or misleading estimate. A lower rate than the cap doesn't resolve those separate issues.

Does a higher Direct Debit prove my supplier raised its prices?

No. Direct Debit reviews can reflect usage or an account balance. Ask for the calculation and compare the payment change with the actual unit rates and meter readings.

How long do I have before using the Energy Ombudsman?

You can usually refer the case after a deadlock letter or once eight weeks have passed. The ombudsman generally expects a referral within 12 months of the deadlock or final-response date, so keep that letter and check its deadline.

Will I automatically receive compensation?

No specific payment is automatic. Ask for a refund or credit for a demonstrable overcharge and describe any service failure separately. The ombudsman decides what remedy, if any, is appropriate under its process.

Start by photographing your meter, downloading the disputed bill, and sending the supplier a dated formal complaint.