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A higher bill is not automatically an incorrect price rise. In Great Britain, check the billing dates, meter readings, billed kWh, unit rates, standing charges, taxes and account adjustments in that order. A longer billing period, higher consumption, an estimated reading later replaced by an actual reading, or a supplier rate change can each raise the total. Ofgem’s price cap limits eligible unit rates and standing charges; it does not limit the amount a household can pay when it uses more energy.
Scope: which bills this guide covers
This guide applies to domestic energy customers in England, Scotland and Wales. Ofgem’s cap tables and the GOV.UK meter guidance cited here do not automatically apply in Northern Ireland, Australia or other countries, where the regulator, taxes and supplier rules differ.
The checks work for electricity, gas and dual-fuel bills, including bills for standard variable tariffs, fixed tariffs and prepayment accounts. The relevant price-cap table depends on your region, payment method, fuel, meter and tariff eligibility, so never compare a bill with a national headline figure alone.
What an energy bill should show
Before calculating anything, find the fields that explain how the supplier produced the total. Bills use different layouts, but the information normally appears in a summary, a usage section and an account-balance section.
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| Bill field | What to check | Why it matters |
|---|---|---|
| Account and supply details | Name, supply address, account number and the electricity meter point or gas meter identifier | Confirms that the charges belong to the correct property and meter. |
| Billing period | Opening and closing dates and the number of days | A longer period can increase the total even when prices have not changed. |
| Meter readings | Opening and closing readings, with each marked actual, customer-submitted, smart or estimated | Estimates can later be replaced by an actual reading, creating a catch-up charge or credit. |
| Consumption | Electricity and gas usage in kilowatt-hours (kWh), split by rate or time band where applicable | This is the quantity multiplied by each unit rate. |
| Unit rate | Pence per kWh for each fuel and each period | A rate change inside the billing period requires separate calculations. |
| Standing charge | Pence per day and the number of days charged | This fixed daily amount applies whether or not you use energy. |
| VAT, fees and adjustments | VAT, late-payment or other permitted fees, discounts, government credits and corrections | These items can change the amount after usage charges are calculated. |
| Account balance and payments | Previous balance, payments received, refunds and the closing amount due or credit | The amount due may include an old balance and is not necessarily this period’s energy cost. |
Step 1: check the dates before judging the increase
- Write down the bill’s start date, end date and stated number of days.
- Compare those dates with the previous bill. A bill covering 45 days cannot be compared directly with one covering 30 days without allowing for the extra days.
- Look for a tariff or price-change notice and its effective date. If the billing period crosses that date, divide the usage into the days or meter readings covered by each rate.
- Check whether the supplier issued a late bill or a corrected bill. A correction can include energy used in an earlier period or reverse a previous estimate.
Do not infer a price rise from the total alone. First determine whether the supplier billed more days, more kWh, a different rate, or a balance carried forward.
Step 2: verify meter readings and usage
Match the meter and readings
Compare the meter identifier on the bill with the identifier on the physical meter or your online account. Then compare the opening and closing readings with photographs, smart-meter history or readings you submitted. Record the reading type shown on the bill:
- Actual: taken by a meter reader, sent by you or obtained from a communicating smart meter.
- Customer-submitted: entered by you on a stated date; retain the photograph or confirmation.
- Smart: received electronically, subject to the meter’s communication status.
- Estimated: calculated by the supplier when no usable reading was available.
An actual closing reading can make a new bill look unusually high when an earlier estimated bill understated consumption. The new bill is then catching up previously unbilled use, not necessarily applying an excessive rate. GOV.UK lists increased consumption and a supplier price rise among possible causes of a high bill and explains how to check readings at its high-bill guidance.
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Recalculate electricity kWh
For a single-rate electricity meter, subtract the opening reading from the closing reading. For example, a closing reading of 18,420 kWh minus an opening reading of 18,000 kWh gives 420 kWh. Check whether the supplier has already applied a correction, rollover or meter exchange adjustment; never subtract readings from different meters without following the replacement-meter instructions.
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Handle multi-rate electricity
Economy or time-of-use meters show separate registers, such as peak and off-peak. Reconcile each register separately and apply its own unit rate. If the bill lists a total kWh without the register detail, ask the supplier for the underlying readings and rates rather than applying one rate to all consumption.
Check gas readings in the units shown
Gas meters may display volume (usually cubic metres or, on older meters, hundreds of cubic feet), while the bill charges for energy in kWh. The supplier converts the meter volume using the meter type, a correction factor, the gas calorific value and a prescribed unit conversion. GOV.UK’s gas meter-reading and bill-calculation guidance describes the method.
The prescribed example uses a 1.02264 correction factor and then divides by 3.6 to convert to kWh after applying the meter-unit and calorific-value factors. In simplified form for a metric meter:
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kWh = volume (m³) × correction factor (1.02264) × calorific value (kWh/m³) ÷ 3.6
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Your bill should show the actual calorific value and conversion inputs used for that period. Do not substitute an electricity reading, a guessed calorific value or a conversion from a different bill.
Step 3: reproduce the tariff arithmetic
Calculate each fuel and each rate period separately:
Usage charge = billed kWh × unit rate (pence per kWh)Standing-charge total = daily standing charge (pence) × billed daysPeriod total = usage charge + standing-charge total ± VAT, fees, credits and account adjustments
- Copy the billed kWh and unit rate exactly as printed, retaining the pence units.
- Multiply each usage quantity by its matching rate. Keep peak, off-peak and other bands separate.
- Multiply the daily standing charge by the billed number of days. Electricity and gas have separate standing charges.
- Add the usage and standing-charge amounts, then apply the VAT treatment, fees, discounts, credits and corrections shown on the bill.
- Compare the result with the bill’s subtotal. The remaining difference should be explained by rounding, a balance brought forward or another listed adjustment.
Illustrative calculation
The following is an arithmetic illustration, not a forecast of a household bill. At the Direct Debit averages Ofgem lists for 1 October–31 December 2026, 300 kWh of electricity at 26.32p/kWh is £78.96, and 90 days of a 54.83p daily standing charge is £49.35. The subtotal is £128.31 before any bill-specific taxes, credits or balance. For gas, 800 kWh at 7.97p/kWh is £63.76, and 90 days at 29.68p/day is £26.71, giving £90.47 before those adjustments.
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- Upgraded LCD display: With large screen size 2.36 inch x 1.85 inch, clearer monitor backlit, our electrical usage monitor can display the data clearer and more visible no matter day or night. 180°full wide viewing angles is great for reading and recording the data in any angles. No need to stand on the front of the display and bend over to read the numbers
- Adjustable Backlight Time: Our upgraded watt meter has 5 options of backlight time. The default backlight time duration is 10 minutes(bL-0). If you want to change the backlight time, you can press and hold "UP" and "DOWN" button at the same time to enter backlight time setting, then press "UP" and "DOWN" to select the backlight time (bL-0 =10 minutes, bL-1=1 hour, bL-2=4 hours, bL-3=8 hours, bL-4=always on), finally press the "COST" to save the backlight time settings
- Overload protection: When the power of the appliance exceeds the overload power, the LCD will display “OVERLOAD” to warn the user. All the buttons will quit working and can only be workable when you lower or remove the load power. The default overload power is 3680W and is adjustable from 0 to 3680W. In general, you need to set the overload power to 1800W before using. Just press the "function" button for more than 3 seconds to enter the setting
- Data Memory Function: The wattage meter will record your power consumption data when you remove it from socket, or remove appliances from the electricity monitor. You can directly see the last data when you use it next time. This function can also automatically save the data when there is a sudden power failure
If a bill contains two rate periods, repeat the calculation for each segment and add the segments. Applying the newest rate to all kWh in a period that straddles a change date is a common source of an apparent discrepancy.
Step 4: compare the bill with the correct Ofgem price-cap figures
Ofgem’s unit-rate and standing-charge tables are organised by region, payment method and tariff type. Select the table matching your location and payment method; a Direct Debit average is not the correct benchmark for a prepayment or standard-credit account.
| Ofgem figure | 1 October–31 December 2026 Direct Debit average | Qualification |
|---|---|---|
| Electricity unit rate | 26.32p/kWh | Average across Great Britain regions; your regional rate may differ. |
| Electricity standing charge | 54.83p/day | Direct Debit average; meter and region affect the applicable figure. |
| Gas unit rate | 7.97p/kWh | Average across Great Britain regions; includes 5% VAT. |
| Gas standing charge | 29.68p/day | Direct Debit average; includes the gas VAT treatment stated by Ofgem. |
| Typical annual price-cap figure | £1,723 | Ofgem’s average Direct Debit unit rates and standing charges for 1 October–31 December 2026 in England, Scotland and Wales; not a limit on an individual bill. |
Ofgem reports no electricity VAT from 1 October 2026 to 31 March 2027 and warns that the tax change makes direct comparison with the previous period limited. Carry the VAT qualification with any comparison; do not treat the pence figures as tax-neutral or timeless.
What the cap does and does not do
Ofgem explains the scope and standing charges on its price-cap explanation. The cap limits the permitted unit rate and standing charge together for covered tariffs. It does not cap a household’s total bill: the more energy used, the higher the total can be.
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The consumer explanation identifies standard variable tariffs as covered. Fixed tariffs, business contracts, heat networks and heating oil are outside the stated protection. A bill on one of those arrangements should be checked against its contract, not assumed to match an Ofgem cap table.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why a bill can rise even when the supplier’s rate is correct
| Likely cause | Evidence on the bill | Check to perform |
|---|---|---|
| Higher consumption | More kWh, longer heating or appliance use | Compare actual kWh with the same number of days in the previous period; inspect smart-meter or manual reading history. |
| Rate increase | Higher pence-per-kWh or standing-charge figure with an effective date | Split the bill at the effective date and compare each rate with the applicable contract or Ofgem table. |
| Longer billing period | More billed days | Compare daily usage and daily standing-charge totals, not just the invoice totals. |
| Estimate replaced by actual | Current reading marked actual and a large difference from the prior estimate | Match both readings to dated photographs or account history; ask for a correction if either reading is wrong. |
| Gas conversion change | Different volume, calorific value or conversion details | Recalculate from the meter units and inputs printed for that bill. |
| Account adjustment | Balance brought forward, correction, fee, credit or payment reversal | Reconcile the account ledger separately from this period’s usage. |
| Tax treatment | VAT line or tax rate differs from the previous period | Check the dates and the VAT explanation; for October 2026–March 2027 electricity, note Ofgem’s stated no-VAT treatment. |
What to send the supplier when the numbers still do not reconcile
Contact the supplier before assuming the price increase is unlawful. Use the supplier’s formal complaint channel so the issue is logged, and include the account number, supply address, meter identifier, dated readings and a copy of the bill.
Ask for an itemised explanation containing:
- the opening and closing readings used, and whether each is actual, smart, customer-submitted or estimated;
- the billed kWh for every fuel, register and rate period;
- each unit rate, standing charge and effective date;
- the number of days used for every standing-charge line;
- gas meter units, calorific value, correction factor and conversion calculation where relevant;
- VAT, fees, discounts, credits, corrections and the account balance brought forward; and
- the contract or price-cap table used to validate the rates.
Send a current meter reading at the same time and keep the submission confirmation. A concise request can state: “Please reconcile the attached bill using the meter readings provided and show the kWh, rate, standing-charge days, taxes and account adjustments for each period.”
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First rule out a wrong meter identifier, an incorrect reading, an estimate catch-up and a genuine increase in consumption. GOV.UK says an electricity meter that incorrectly records usage can cause a high bill but describes this as unusual in its guidance published 2 July 2018.
Ask the supplier to investigate. It may install a check meter. If you remain dissatisfied, ask about an independent test and the associated terms before agreeing to it. The GOV.UK page states that meter accuracy tests were free but that a customer could have to pay the supplier’s organisation cost when the meter proved accurate; it says this was true for the vast majority of meters tested in 2021. That is a dated statement, not a current fault-rate estimate, so confirm today’s charges and process with the supplier.
Do not tamper with a meter or disconnect supply to test it. Keep paying undisputed amounts while the complaint is examined, and ask the supplier how it will handle any disputed balance.
Escalating an unresolved complaint
- Use the supplier’s complaints procedure and obtain a complaint reference.
- Provide the readings, arithmetic and specific lines you dispute; distinguish a rate objection from a reading or meter-accuracy objection.
- Keep copies of bills, photographs, messages and dates of calls.
- If the supplier does not resolve the issue, follow the escalation route described by GOV.UK and consider the Energy Ombudsman route identified in the official high-bill guidance.
A reusable bill-check checklist
- Is the bill for the correct address, account and meter?
- What exact dates and number of days does it cover?
- Are the opening and closing readings correct, and what type is each reading?
- How many kWh were billed for each fuel and register?
- Did a rate change occur inside the period, requiring a split calculation?
- Are unit rates and standing charges checked separately?
- For gas, do the meter units, calorific value, correction factor and kWh conversion agree with the bill?
- Do VAT, fees, credits, payments and the previous balance explain the final amount?
- Is the Ofgem comparison for the correct region, payment method, tariff and price-cap quarter?
- Have you sent a current reading and requested an itemised explanation if anything remains unexplained?
Bottom line
A correct price check is a line-by-line reconciliation, not a comparison of two headline totals. Establish the days and readings first, calculate every rate period and standing charge, verify gas conversion and account adjustments, then compare the result with the correctly dated Ofgem table or your fixed-tariff contract. If the arithmetic or readings still fail to match, require the supplier to explain them in writing and use the formal complaint and Ombudsman path if necessary.
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