How to Read Your Energy Bill UK

Energy bills arrive quarterly (or land in your inbox monthly for smart-meter customers) and most households glance at the total, wince, and move on. But buried in those pages are figures that tell you exactly whether your supplier is charging correctly, whether your direct debit is set at the right level, and — if you have solar panels — how much you're earning back from exported electricity. This guide walks through every section of a standard UK dual-fuel bill using the Ofgem April–June 2026 price cap rates, in plain English.

The unit rate: what you pay per kilowatt hour

The unit rate is the headline price for energy you actually consume. It is quoted in pence per kilowatt hour (p/kWh) and appears separately for electricity and gas. Under the Ofgem price cap for April–June 2026, the average unit rate across England, Scotland and Wales is 24.67p/kWh for electricity and 5.74p/kWh for gas — both figures include 5% VAT and apply to direct debit customers on a standard variable tariff.

If you are on a fixed tariff, your unit rate will differ — it could be higher or lower than the cap depending on when you locked in. If your bill shows a rate materially above the cap equivalent for your region, you may be on an old out-of-contract rate and worth switching. Ofgem publishes regional rates at its unit rates and standing charges page, so you can compare your bill against the cap for your specific network area.

The standing charge: the daily fixed fee

The standing charge is a fixed daily fee you pay regardless of how much energy you use. It covers maintaining the infrastructure that delivers energy to your home — the pipes, cables, meters, and billing system — as well as some government social and environmental schemes. For April–June 2026, the Ofgem price cap sets the average standing charge at 57.21p/day for electricity and 29.09p/day for gas, inclusive of VAT.

Standing charges vary more by region than unit rates do, because local network costs differ. If you use very little energy, the standing charge can become a significant proportion of your annual bill: for a low-user household, the combined annual standing charge alone is around £315 (57.21p × 365 + 29.09p × 365). Some suppliers offer standing-charge-free tariffs, but these typically carry higher unit rates — they are only advantageous for very low-consumption homes.

How your annual cost is calculated

Your bill is built from three components: energy consumed, standing charge, and VAT. The formula is straightforward:

Annual cost = (units used × unit rate) + (standing charge × 365 days) + 5% VAT

Ofgem uses typical domestic consumption values (TDCVs) to calculate the headline price cap figure: a typical household uses 2,700 kWh of electricity and 11,500 kWh of gas per year. At April–June 2026 cap rates, that works out to an annual bill of approximately £1,641 for a dual-fuel direct debit customer — a figure Ofgem confirmed when announcing the Q2 2026 cap.

You can apply the same formula to your own consumption figures — found on your bill or estimated from your meter readings — to check your supplier's calculation is correct.

Meter readings: actual versus estimated

Your bill will be based on either an actual meter reading or an estimate. Estimated reads are generated by your supplier using algorithms based on past usage and are marked with an 'E' on most bills. Estimated bills can accumulate significant credit or debt over time if your actual usage differs from the model.

If you have a smart meter, readings are submitted automatically — usually every 30 minutes — so estimated bills should not occur. Without a smart meter, you can submit your own readings via your supplier's app, website, or phone line. Always read from the meter itself rather than relying on the supplier's estimate if you suspect your bill is wrong. Citizens Advice guidance on disputing a bill recommends starting with a fresh actual reading.

Account balance and direct debit

The account balance section shows whether you are in credit or debit. A credit balance means you have paid more than you have used; a debit balance means the opposite. Suppliers are required under Ofgem's rules to refund a credit balance promptly on request — you do not need to leave it sitting with your supplier as a float.

Your direct debit amount is set to roughly equate annual charges divided by 12 monthly payments. It is recalculated periodically by your supplier. If your direct debit is significantly higher than your actual monthly cost, you are in effect giving your supplier an interest-free loan; if it is too low, you will build up a debt. You can request a direct debit review at any time.

Your tariff name and end date

Every bill must state the name of your tariff and, for fixed-term deals, when it ends. The tariff name appears in the account summary section. If you are on a standard variable tariff (SVT), it will typically say something like "Standard Variable", "Flexible", or "Variable" in the tariff name. Fixed tariffs show an end date — as that date approaches, your supplier should write to you with rollover options; if they do not, you will usually move to their SVT automatically.

VAT on your energy bill

Domestic energy in the UK is charged at the reduced VAT rate of 5%, rather than the standard 20% rate. This applies to both electricity and gas, including the standing charge element. The 5% rate is confirmed under HMRC's VAT Notice 701/19 (Fuel and Power). Your bill will show the net amount, the 5% VAT charge, and the gross total — or the VAT may be included within the per-unit and standing charge figures (as is the case with Ofgem's published cap rates).

MPAN and MPRN: your meter reference numbers

Your MPAN (Meter Point Administration Number) identifies your electricity supply point. It is a 21-digit number, typically printed at the bottom of the electricity section of your bill, often inside a grid of boxes. Your MPRN (Meter Point Reference Number) is the equivalent for gas — usually an 8-to-10-digit number on your gas bill. These numbers are tied to your property, not your supplier, and you will need them when switching supplier or if you need to contact your network operator directly about a supply fault.

Warm Home Discount shown as a credit

If you are eligible for the Warm Home Discount, it appears as a £150 credit on your electricity bill, usually applied between October and March. The scheme is administered by Ofgem and DESNZ; eligible households receive the discount automatically if the DWP data match confirms entitlement — you do not need to apply. For the 2025–26 scheme year the discount remained at £150 and covered pensioners on Pension Credit Guarantee Credit (Core Group 1) and households on qualifying means-tested benefits (Core Group 2). The scheme reopens in October 2026.

How solar and SEG credits appear

If you have solar panels and a Smart Export Guarantee (SEG) tariff, your export payments appear as a credit on your electricity bill. Under the SEG, your licensed electricity supplier must pay you for every unit of surplus electricity you export to the grid. Export rates vary by supplier and tariff — among the most competitive in 2025–26 were fixed-rate offers above 15p/kWh — and the credit is separate from any reduction in the electricity you import.

Your bill will show exported units (read from your smart meter's export register), the applicable export rate, and the resulting credit. This credit offsets your import charges on the same bill. If you are considering solar, our guide to the best SEG rates in 2026 compares current tariffs, and our overview of solar panel costs in 2026 puts the savings in context.

How to check you are not being overcharged

Three quick checks catch the most common billing errors. First, compare your unit rate and standing charge against the Ofgem cap for your region — if you are on a standard variable tariff, you should not be paying above the cap. Second, verify that the consumption figure on your bill matches your meter reading, not an outdated estimate. Third, if your account shows a large credit balance (more than one month's expected spend), contact your supplier to request a refund — under Ofgem supplier rules they must process it promptly.

If you believe your bill is wrong after doing these checks, Citizens Advice's consumer energy helpline and the Energy Ombudsman are the escalation routes. Keep meter reading photographs with timestamps as evidence.