Referral Plug · Tools
EV tariff calculator
Put in your region, mileage and home use to see a year’s bill on each EV tariff from Octopus, E.ON Next and EDF, and whether a standard tariff at the price cap would beat them all.
Supplier rates read 8 November 2026. Cap rates: Ofgem, 1 October to 31 December 2026 (opens in new tab). Maintained by Seb Place.
What would a year cost you?
Your region, mileage and home use, priced on each EV tariff and against a standard tariff at the price cap.
EDF GoElectric
£1,252 a year, £211 less than a standard tariff at the price cap.
| Tariff | A year | Saves vs standard |
|---|---|---|
| EDF GoElectric | £1,252 | £211 |
| Octopus Go Variable | £1,270 | £194 |
| E.ON Next Drive | £1,283 | £180 |
| Octopus Go Fixed | £1,363 | £101 |
| Standard tariff at the price cap | £1,464 | £0 |
Direct Debit rates from each supplier’s public tariff data, read 8 November 2026, and the Ofgem price cap for 1 October to 31 December 2026. Assumes 3.5 miles per kWh and all charging in the cheap hours. British Gas EV Power is left out because its day rate appears only in a quote. This is an estimate, so check the rate for your address before you switch.
How this calculator works, and what it assumes
- Supplier rates are Direct Debit rates from Octopus Energy, E.ON Next and EDF public tariff data, read 8 November 2026 and re-read on the weekly verification pass. Each region has its own rates, and “Average” is the mean bill across all of them.
- The maths: the car’s electricity is your miles ÷ 3.5 miles per kWh, rounded to the nearest 100 kWh and priced at the tariff’s overnight rate. The house is priced at the peak rate, except the share you can move into the cheap hours. A year of standing charges, the fixed daily cost of supply, goes on top, and any bill credit comes off.
- The standard tariff row prices the car and the house at your region’s Ofgem cap for 1 October to 31 December 2026: one unit rate at any hour, plus the cap’s standing charge.
- A compatible car or charger adds the smart tariffs, which other cars can’t join, and an estimate for OVO Charge Anytime. OVO publishes no regional rates, so its row uses 13.33p for the car and your region’s price cap for the house.
- What this can’t tell you: it counts no exit fees and no referral rewards, and it leaves out British Gas EV Power, whose day rate appears only in a quote. It assumes every charge happens at home in the cheap hours, so public charging, or a car that does better or worse than 3.5 miles per kWh, moves the real bill. I don’t drive an EV, so this is arithmetic on published rates, not charging experience of mine.
For the ranking, the cheapest tariff in each region and what you need before you can switch, read the best EV tariffs in the UK.