You could be saving £320 on your energy.

An EV tariff is an electricity tariff designed for electric vehicle owners. It offers a much cheaper unit rate overnight or during smart-scheduled charging, typically around 6.5p to 9p per kWh, in exchange for you shifting your charging to those hours.

Compare EV tariffs on four things: the off-peak rate, the length and timing of the cheap window, the peak rate in your region, and any equipment requirements. The cheapest overall tariff for the year is not always the one with the lowest headline rate.

As of July 2026, So Energy’s So EV advertises around 6.5p per kWh between midnight and 5am, the lowest we found. EDF GoElectric Overnight is close behind at around 6.99p with a longer seven-hour window.

Yes, in almost every case. Suppliers need half-hourly readings to bill the cheap window accurately. If you do not have one, your supplier will usually install one when you switch.

Not for fixed-window tariffs. Smart tariffs such as Intelligent Octopus Go and OVO Charge Anytime need a compatible car or a compatible home charger so the supplier can schedule the charging.

On most fixed-window tariffs, yes. Anything running during the window, including dishwashers, storage heaters and heat pumps, gets the off-peak rate. EV-only add-ons such as OVO Charge Anytime apply the cheap rate to the car alone.

At around 7p per kWh and a typical 3.5 miles per kWh, home charging costs roughly 2p a mile. On a standard capped rate of around 26p per kWh, the same mile costs around 7.5p. Public rapid charging is usually 15p to 20p a mile or more.

You pay the tariff’s peak rate for those hours, which is usually at or above the regional price cap rate. If you regularly need more hours than the window offers, a longer window or a smart tariff will likely cost less overall.

Yes. Ofgem sets fourteen regional caps, so peak rates and standing charges differ by postcode. In July 2026, capped unit rates range from around 25.1p to 27.7p per kWh depending on region.

They work on the same principle of cheaper overnight electricity, but EV tariffs usually offer much lower night rates than Economy 7 and are billed through a smart meter rather than a dedicated Economy 7 meter.

Usually, yes, and the combination can work well: charge the battery and car cheaply overnight, then run the house on solar during the day. Check the supplier’s terms, as some smart tariffs have specific compatibility rules.

It varies. Some are variable tariffs with no exit fee, while fixed versions may carry one. Check the tariff’s terms before you switch, especially if you might move house or change car soon.

No. Switching supplier or tariff is an administrative change. Nothing is rewired and your supply is never interrupted.

Comparing takes about sixty seconds. The switch itself typically completes within five working days, and your new supplier handles the process.

Mostly no. Suppliers generally ask you to confirm you own or lease an EV, and So Energy checks the vehicle is registered in the UK. If you do not have an EV, a standard time-of-use tariff may still cut your overnight costs.