Energy bill suddenly too high? What to check, in order

Great Britain · Rules checked 24 October 2026 · Not legal advice

Before assuming the meter is broken (Citizens Advice says faults are rare), work through these checks.

1. Estimated or actual? Look for "E" or "estimated" next to the readings. If estimated, send a real reading and ask for a corrected bill. See estimated bills.
2. What period does it cover? A bill covering more than a year may be a back-bill. Use the back-billing calculator.
3. Is it your meter? Check the MPAN (electricity) or MPRN (gas) and the meter serial number match your meter. See wrong meter or previous occupant.
4. Did your tariff change? A fixed deal ending, or a price cap change, can raise costs. Check the unit rate and standing charge on the bill.
5. Has your use changed? Winter heating, a new appliance, or people working from home.
6. Still unexplained? Do the switch-off test and ask for an investigation: see faulty meters.

Whatever the cause, you can ask the supplier to explain how the bill was worked out, in plain language (SLC 21B.7). If you can't afford it, ask for an affordable plan.