Wiso Savings · Updated 3 November 2026
How to compare energy tariffs
A practical way to compare the cost of energy for your own home.
Start with the same household
Find your annual electricity and gas use in kWh on your bill or supplier account. Use those same numbers for every quote. A monthly payment is not a reliable measure of usage: it may include debt repayment or a balance adjustment. Have your postcode, payment method and meter type ready for the supplier.
Compare the total, not one attractive rate
For a single-rate tariff, calculate each fuel separately: annual kWh × unit price in pence, plus 365 × daily standing charge in pence. Divide by 100 for pounds. Use VAT-inclusive rates consistently. As a made-up example, 2,500 kWh at 25p and a 50p daily charge costs £807.50 for electricity over a year. That is arithmetic, not an available offer.
Check what could change the result
Read the tariff end date, exit fees and eligibility conditions. A time-of-use tariff needs your use split between its different price periods. A lower overnight price will not necessarily reduce your bill if most of your use is during the day. Check any required smart meter, equipment or additional service.
Use the directory as a starting point
Wiso lists selected published information. National averages are illustrations, and regional ranges cannot be combined into a single household quote. Ask suppliers for a quote using your own details, then compare that with your existing tariff. Keep a copy of the offer and its conditions before making a decision.
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Written by Wiso Savings. General information for households in Great Britain; check your supplier’s current terms.
Ofgem: energy terms explained · Citizens Advice: choosing a tariff (England)
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