Martin Lewis recently warned about the issue which affects all energy users including those with Ovo, E.ON, British Gas, EDF, Scottish Power and OctopusNicholas Dawson07:08, 22 May 2026Energy consumers might want to consider scrutinising their bills as they could be drastically overpaying. The appeal comes after Martin Lewis recently highlighted this widespread problem.‌There's a danger you could end up paying excessively at this time of year if you settle your energy costs via direct debit. This is because early May is the lowest point of the energy direct debit cycle, when you're likely to be most in credit. Therefore, it's worthwhile taking an up-to-date meter reading to ensure you're being billed accurately, and that you're not excessively in credit. If that's the case, you could request a refund from your provider.‌Angus Struthers, managing director at home heating and cooling firm BOXT, said: "Direct debits are meant to stop your energy bills swinging wildly from month to month. But they only work properly if your supplier has the right information.‌"If your bills are based on estimates, or your energy use has changed, you could be paying far more than you need to, or not enough and slowly building up debt." He outlined the crucial details you should verify.Check your bill is correctMr Struthers said: "The key things to check are your account balance, recent meter readings and monthly payment amount. If you're sitting on a chunky credit balance, it may be worth asking your supplier why.State Pensioners to face major tax change‌"And with energy rates expected to rise, making sure your account is accurate now could help avoid a nasty surprise later in the year." He set out how regularly overpaying small amounts can accumulate into a substantial sum over time.The specialist said: "It can add up quickly. Overpaying by just £25 a month means £300 is sitting in your supplier's account over a year, rather than in yours. Some summer credit is normal, as it helps balance out higher winter use."But if your credit keeps growing, or your bills are based on old readings, I would say that it is worth challenging. Your direct debit should reflect what you actually use, not just what your supplier guesses."‌He outlined the steps to check your bill is correct, advising: "Check whether it is based on actual meter readings or estimates, whether your smart meter is sending readings properly, and whether your tariff, unit rates, standing charge and payment method are correct."Energy saving habitsFor those looking to lower their energy bills, Mr Struthers suggested focusing first on heating and hot water expenses. He said these typically represent big portions of household energy bills.Investing in a more efficient boiler could prove financially beneficial in the long term. The specialist said: "A refund may not pay for a new boiler, but it could go towards a boiler service, better heating controls, or planning for an upgrade.Article continues below"BOXT analysis shows that moving from a G-rated boiler to an A-rated model could save up to £572 a year for a detached four-bed home, so putting that money back into home efficiency could pay off long term." Now is also an ideal period of the year to get prepared and check over your property before the colder months arrive for next winter.Mr Struthers said: "Summer is actually one of the best times to service a boiler, before demand ramps up again in the cold weather. A boiler that is not serviced regularly can lose efficiency, which may mean higher bills once the heating goes back on."Radiators, thermostats, heating controls and thermostatic radiator valves are also worth checking now, as small faults can gradually waste energy for months."