So Energy EV Tariff Review 2026

So Energy’s So EV tariff offers 7.14p/kWh across a simple midnight-to-5am window from 1 October 2026, with 100% renewable electricity and no smart hardware requirements. That makes it one of the cheapest overnight EV rates available, behind only E.ON Next Drive Smart and EDF GoElectric among the major tariffs we track.

This review covers So EV in full: what it costs, how to get it, what it doesn’t offer, and who it’s best suited to.

How the So EV tariff works

So EV is a whole-home time-of-use tariff, fixed for 12 months. During the overnight off-peak window (00:00–05:00), you pay the off-peak rate for all electricity consumed in your home, not just for EV charging. This means your dishwasher, washing machine, and other overnight appliances all benefit from the cheaper rate.

So Energy advertised the rate as 7.5p/kWh including 5% VAT. VAT on household electricity is 0% from 1 October 2026 to 31 March 2027, and So Energy says the cut applies automatically to all its tariffs, fixed ones included, so the rate you pay from 1 October is 7.14p/kWh.

There is no smart dispatch. You set your home charger or EV to charge during the overnight window using your car or charger’s built-in timer. It works with any charger and any UK-registered electric car or plug-in hybrid.

A smart meter set to half-hourly readings is required. If you don’t have one, So Energy will arrange installation free of charge, though timescales vary.

How to join So EV

New customers can’t join So EV directly. You switch to So Energy’s standard variable tariff, So Flex, first; the supply transfer takes around five working days. Once So has checked your smart meter is sending half-hourly readings, it invites you to move to So EV, which takes about five more days. So Energy says you must tick the option to hear about rewards and updates during sign-up, or it can’t send you the invitation.

Existing So Energy customers can move to So EV from another So fixed tariff at any time without an early exit fee.

The rate advantage: how much can you save?

At 7.14p/kWh overnight versus the October 2026 price cap average of 26.32p/kWh, the saving is about 19p on every kWh. For a typical 60kWh EV battery charged from empty:

• So EV cost: about £4.28
• Price cap average cost: about £15.79
• Saving per full charge: approximately £11.50

For a driver covering 10,000 miles a year in a 3.5 miles-per-kWh car, annual charging energy is approximately 2,857kWh. At 7.14p versus 26.32p, the annual saving on charging is approximately £548.

Day rate and standing charge

So Energy does not publish So EV’s daytime rate or standing charge without a postcode quote. It says the daytime rate is its current fixed-rate tariff price rather than a separate peak rate, and that its fixed tariffs are priced below the Ofgem price cap. Other EV tariffs charge a premium outside their cheap window: average peak rates run from 32.99p/kWh (EDF GoElectric, 18 months) to 38.90p/kWh (Intelligent Octopus Go). If So’s day rate in your area comes in below those, So EV is a strong all-round deal; get a quote and compare before switching.

Provider	Off-peak	Peak (average)
So Energy So EV	7.14p/kWh	Quote only
EDF GoElectric	6.66p/kWh	35.21p/kWh
Intelligent Octopus Go	8.0p/kWh	38.90p/kWh
E.ON Next Drive Smart	6.5p/kWh	34.04p/kWh
British Gas EV Power	9.5p/kWh	36.90p/kWh

Who is So EV best for?

• Overnight chargers who want one of the lowest fixed-window rates available
• Drivers with any charger or EV who can’t access smart dispatch tariffs
• Green-minded households who want 100% renewable electricity
• Households that run appliances overnight and want the whole-home off-peak benefit

Who should consider other options?

If you want smart dispatch (automated scheduling that finds the cheapest charging slots), So Energy doesn’t offer it. Intelligent Octopus Go and E.ON Next Drive Smart both add smart charging slots outside their overnight windows, and E.ON Next Drive Smart has one of the lowest published day rates of the major EV tariffs.

If you want a lower overnight rate and a longer window, EDF GoElectric is 6.66p/kWh for seven hours, though it carries a £75 exit fee per fuel.

So Energy as a supplier

So Energy is a smaller UK supplier that has grown steadily since launching in 2015. It has built a reputation for competitive pricing and reasonable customer service, and So EV won a 2026 Uswitch Flex Accreditation, though its app and digital tools are less developed than those at Octopus.

Our verdict on So Energy So EV

So EV is one of the best-value fixed-window EV tariffs from 1 October 2026: 7.14p/kWh overnight, 100% renewable electricity, and no compatibility requirements. The unknowns are the day rate and standing charge, which So only shows in a quote, and the extra step for new customers, who join So Flex first.

If your charger or car is on the Octopus or E.ON compatibility lists, the smart tariffs are worth comparing for their extra cheap charging slots. Run the numbers on your full household usage, not just the headline overnight figure, before switching.