Updated 24 October 2026. Rates change often and some vary by region, so check the supplier's own page before you switch.
A Juicy battery charges overnight when electricity is cheap and powers your home when it's expensive. The gap between those two prices is your saving, so your tariff decides most of it.
Our savings model puts it at £440 to £1,141 a year, depending on how much electricity you use.
Without Juicy assumes the Jul '26 price cap of 26p/kWh. With Juicy assumes a smart tariff at 9p/kWh off-peak and 32p/kWh peak, with the battery charging overnight and running the home through the day. Prices held flat; no solar. Your quote uses your own bill.
The short answer
You have an EV: E.ON Next Drive Smart is the cheapest overnight rate we found, at 6.5p/kWh, if your car and charger are eligible. So EV (7.5p) comes next.
You don't have an EV: look at Octopus Agile or British Gas Charge Power. Neither needs an EV.
For comparison, the price cap unit rate from 1 October to 31 December 2026 averages 26.32p/kWh.
Tariffs compared
Tariff | Cheap rate | Cheap hours | Who can get it |
|---|---|---|---|
E.ON Next Drive Smart | 6.5p/kWh | Midnight to 6am | Eligible EV and charger |
So EV | 7.5p/kWh | Midnight to 5am | UK-registered electric or plug-in hybrid car |
Intelligent Octopus Go | 8p/kWh | 11:30pm to 5:30am | Doesn't work with a Juicy battery |
E.ON Next Drive | 8.5p/kWh | Midnight to 6am | EV drivers. No EV? Confirm eligibility with E.ON directly |
Octopus Go | 9.4p/kWh | 12:30am to 5:30am | EV charged at home. No home charger needed |
Octopus Agile | About 20p/kWh for the cheapest 3.5 hours a day (10 to 23 Oct average) | Changes every half hour | Anyone with a smart meter |
British Gas Charge Power | Half your British Gas unit rate | Midnight to 5am | Any home battery |
EDF FreePhase | Varies by region | Green band, 11pm to 6am | Anyone with a half-hourly smart meter |
Every tariff here needs a smart meter. Octopus Go charges the same overnight rate in every region.
If you have an EV
E.ON Next Drive Smart, 6.5p/kWh, midnight to 6am. The cheap rate covers your whole home, not just the car. You need an eligible EV and charger, and a smart meter sending half-hourly readings. E.ON can move you off the tariff if you stop using its smart charging.
So EV, 7.5p/kWh, midnight to 5am. Any UK-registered electric or plug-in hybrid car qualifies, with any charger. New customers join So Energy's So Flex tariff first, then move across.
Intelligent Octopus Go, 8p/kWh, 11:30pm to 5:30am. It doesn't work with a Juicy battery, so we don't recommend it if you're getting one. If you're on it now, we'll recommend a tariff that does.
E.ON Next Drive, 8.5p/kWh, midnight to 6am. E.ON sells it as an EV tariff. If you don't have an EV, you'd need to confirm eligibility with E.ON directly.
Octopus Go, 9.4p/kWh, 12:30am to 5:30am. You need an EV you charge at home, but not a home charger.
If you don't have an EV
Octopus Agile. The price changes every half hour with the wholesale market, and tomorrow's prices come out each afternoon. Your battery charges in the cheapest half hours, whenever they fall. From 10 to 23 October, the cheapest three and a half hours of each day averaged about 20p/kWh across Great Britain, against about 50p/kWh from 4pm to 7pm. Prices can also drop below zero. In one region, one half hour in that fortnight cost minus 0.55p, so Agile customers there were paid to use electricity.
British Gas Charge Power. British Gas built this one for home battery owners. It halves your unit rate from midnight to 5am, and you don't need an EV or solar panels. British Gas doesn't publish the rate on its tariff page, so get a quote for your postcode. You'll need an online account and a fixed Direct Debit.
EDF FreePhase. EDF splits the day into three price bands. Green, the cheapest, runs 11pm to 6am. Red, the dearest, runs 4pm to 7pm. FreePhase Dynamic resets the bands daily with the market, capped at 75p/kWh, with no exit fee. FreePhase Static fixes them for 12 months and has exit fees.
What your battery does with the tariff
You don't set anything. Our smart software charges the battery whenever electricity is cheapest on your tariff. That's usually overnight. On Agile it can be any cheap half hour. Set it up once. It runs itself.
Which one should you pick?
Before your battery is switched on, we recommend the tariff that works best with your usage, in writing. You keep your own supplier and make the switch yourself. If a better tariff comes along, we'll tell you.
Get a quote. It takes two minutes online plus your latest bill, and your fixed price comes back within one working day.