The cheapest off-peak rate of all, but only if you bundle. If you already want UW broadband or mobile it's a bargain; if not, the bundle usually eats the saving.
Assumes home charging with 90% of it in the window (100% for flat tariffs). Not sure of your efficiency? Pick your car from the car list.
The whole-house question. The cheap rate applies to everything you use in the window, not just the car — so a dishwasher or immersion heater on a timer also gets 6.9p. But everything outside the window is billed at 27.16p, above the price cap. A household using 3,000 kWh a year of daytime electricity would pay about £25 a year more on the house than on the cap; a moderate peak rate like this one only makes sense if the car saving is bigger than that.
Will your car fill up in the window? A 7 kW charger delivers about 6.3 kWh an hour into the battery. In 5 hours that is roughly 32 kWh, enough to add 110 miles at 3.5 mi/kWh — more than most people drive in a day, but not a full charge on a 75–80 kWh battery from empty. If you regularly arrive home nearly flat, a longer window or a smart tariff that adds slots matters more than a fraction of a penny per kWh.
| Car | mi/kWh | Per month | On the cap | Saving / yr |
|---|
| Tariff | Off-peak | Peak | Window | Per month* |
|---|---|---|---|---|
| Utility Warehouse EV | 6.9p | 27.16p | 5 h | £18.89 |
| EDF GoElectric | 6.99p | 30.0p | 7 h | £19.66 |
| Intelligent Octopus Go | 8.0p | 27.0p | 6 h | £21 |
| Octopus Go | 8.5p | 27.0p | 5 h | £22 |
| E.ON Next Drive Smart | 8.5p | 30.87p | 6 h | £23 |
| British Gas EV Power | 9.0p | 27.5p | 5 h | £23 |
| OVO Charge Anytime | 14.0p | — | 24 h | £30 |
| Standard price cap | 26.32p | — | 0 h | £56 |
*8,000 miles a year, 3.5 mi/kWh, home charging. Standing charges excluded. Rates checked 29 September 2026.
6.9p per kWh, 00:00–05:00 gmt (01:00–06:00 in summer time). Outside the window electricity costs about 27.16p per kWh. Rates checked 29 September 2026.
Smart meter and at least two other UW services (broadband, mobile or boiler cover).
None on energy; bundle services have their own terms.
An 8,000-mile driver in a typical 3.5 mi/kWh EV, charging at home, pays about £18.89 a month for charging on Utility Warehouse EV against £56 on the price cap — around £442 a year. The rest of the house pays the peak rate outside the window, which can eat into the saving if you use a lot of daytime electricity.
Not financial advice. Prices and conditions change; confirm with Utility Warehouse before switching. Use the calculator to include public charging and your petrol comparison.