TL;DR:
- UK smart EV tariffs offer off-peak rates as low as 7–9p/kWh overnight, versus 24–26p/kWh on standard tariffs — a potential saving of £500–£900/year for a typical EV driver
- The savings are real, but depend on actually using scheduled charging — many EV owners set it up once and never check it’s working correctly
- V2G-capable vehicles (Nissan Leaf, Hyundai Ioniq 5/6 with compatible charger) can go further, earning money by exporting to the grid during evening peaks
When EVs first became mainstream in the UK, the advice was simple: charge overnight when electricity is cheap. That advice still holds, but the picture has got more interesting — and more profitable — in 2026 with a wider choice of smart tariffs, the July 2026 price cap change, and growing support for vehicle-to-grid.
Here’s what the numbers actually look like for a typical UK household, and what you need to do to capture the savings reliably.
The Baseline: What Standard Rates Look Like
From July 2026, under Ofgem’s Q3 price cap, the unit rate for standard electricity in England, Wales, and Scotland is approximately 24.5p/kWh. Standing charges vary by region but average around 61p/day.
If you charge an average EV (say, a 77kWh battery, like a Volkswagen ID.7) from 20% to 80% — a 45.8kWh charge — at standard rates, that costs about £11.22. Do that twice a week for a year, and you’re spending roughly £1,170/year on home charging.
That’s your baseline to beat.
What Smart EV Tariffs Offer
Several UK energy suppliers now offer EV-specific time-of-use tariffs with significantly cheaper overnight windows. The three most popular:
Octopus Energy — Intelligent Octopus Go
The standout option for compatible smart chargers (Ohme, Indra, Hypervolt, EO, and others). Off-peak rate: 7p/kWh from 11pm to 5am. Day rate: 24.5p/kWh.
Octopus’s “intelligent” version automatically schedules charging based on your needs — you tell the app when you need the car ready and how much charge, and it finds the cheapest overnight windows (sometimes moving charging to respond to real-time grid pricing, finding windows below 7p).
OVO Energy — Drive Anytime
OVO takes a different approach: rather than a time window, it offers a flat rebate — effectively reducing your pence-per-mile cost by around 3–4p/mile versus standard rates. Simpler to manage, but usually less generous than Octopus for high-mileage drivers.
British Gas — Electric Driver
Off-peak window: 12am–7am at approximately 8.5p/kWh. Available without requiring a specific smart charger, which makes it accessible if you’re using a basic EVSE or a standard Type 2 socket.
Running the Numbers
The same 77kWh EV, same charging pattern (twice weekly, 45.8kWh per charge), on Octopus Intelligent Go at 7p/kWh:
- Cost per charge: £3.21 (down from £11.22)
- Annual charging cost: £333 (down from £1,170)
- Annual saving: £837
For a more modest EV — say a Nissan Leaf with a 40kWh battery, charging 25kWh twice weekly:
- Standard tariff annual cost: £641
- Intelligent Octopus Go annual cost: £182
- Annual saving: £459
These are substantial. For households charging one EV, smart tariff savings often exceed the savings from solar panels in the first few years.
The Catch: You Have to Actually Use It
The savings are only real if your car is actually charging in the off-peak window. Three things go wrong for UK EV drivers:
1. Scheduled charging getting interrupted. Many EVs default to charging immediately on plug-in. If you plug in at 6pm and the car starts charging straight away, you’re paying day rates. Check your car’s scheduled departure time settings (not just the charger app — the car and charger both need to agree).
2. App conflicts between car and charger. If you set a schedule in the charger’s app AND in the car, they can conflict. Generally: let one source control scheduling and disable it in the other.
3. The tariff requires a smart meter, and yours is on an older SMETS1. Most modern smart EV tariffs require a working smart meter in communication with the supplier. SMETS1 meters in some areas still drop off the network periodically. If you’re unsure whether your meter is working correctly, call your supplier.
Checking Your Savings Are Real
The best way to confirm you’re actually capturing the savings: look at your smart meter’s half-hourly data in your energy supplier’s app. You should see a clear spike in consumption during the off-peak window (roughly 11pm–5am for Octopus Intelligent Go) and near-zero usage during peak evening hours.
Octopus customers can also view this in the app’s Energy Tracker. If you see large consumption chunks during peak evening hours every day, your charging schedule isn’t working.
Vehicle-to-Grid: The Next Step
If you own a V2G-compatible EV — currently the Nissan Leaf (both 40kWh and 62kWh), Hyundai Ioniq 5/6, and Kia EV6 on compatible firmware — and install a bidirectional charger (Indra Smart Pro V2G, Wallbox Quasar 2, or Ohme V2G), you can go beyond just saving money to actually earning from your battery.
The principle: charge cheaply overnight, export back to the grid during peak demand (typically 4–8pm weekdays) when prices are high. On Octopus Energy’s Agile tariff combined with V2G, some users are reporting net zero or even negative charging costs for months with high grid export payments.
The economics depend heavily on how much you drive and therefore how much battery capacity you have available to export. V2G is better suited to lower-mileage drivers who park at home for extended periods.
Practical Setup Checklist
If you’re switching to a smart EV tariff:
- Check tariff compatibility with your charger model — Intelligent Octopus Go has the most compatible hardware list
- Set scheduled charging in your car (disable plug-and-charge if it’s enabled)
- Disable or align scheduled charging in the charger app to avoid conflicts
- Register your smart meter with the new supplier and confirm it’s sending half-hourly data
- Check the app after your first week to confirm off-peak charging is actually happening
- Consider Agile export if you have solar panels or a V2G-capable car — the combination can deliver significant bill credits
The savings from overnight EV charging with a smart tariff are among the highest-return energy changes available to UK households right now. The maths is clear — the execution is what most people get wrong.