Cheapest Energy Supplier in the UK

"Cheapest" depends on your usage, region and tariff type. The sticker price rarely tells the full story — exit fees, admin charges and standing charges can wipe out a £100/yr saving in months.

What to look at — beyond the headline price

• Unit rate (p/kWh) for both gas and electricity.
• Standing charge — paid daily even if you use nothing.
• Exit fees — often £75–£150 per fuel on fixed deals.
• Tariff length — 12 months gives flexibility, 24 months locks in the rate.
• Late payment / admin fees — buried in the T&Cs.

How we rank suppliers

Power Guardian's comparison shows the true annual costincluding standing charges and surfaces every flaw — exit fees, admin charges, customer-service issues — so you don't get caught out.