How Much Does an EV Add to Your Electricity Bill? UK Breakdown (2026)

The Short Answer

Charging an EV at home adds between £17 and £59 per month to your electricity bill, depending on your tariff and how much you drive. That is £200 to £700 per year — a fraction of what you would spend on petrol for the same mileage.

The exact increase depends on three things: your electricity tariff, your annual mileage, and your car’s efficiency.

How Much Electricity Does an EV Actually Use?

The average UK driver covers around 10,000 miles per year. Most modern EVs achieve roughly 3.5 miles per kWh in real-world driving:

10,000 miles ÷ 3.5 miles per kWh = approximately 2,860 kWh per year

The average UK household uses around 2,700 kWh of electricity per year for everything else. So an EV roughly doubles your electricity consumption, but not your bill, because the rate you pay per kWh matters enormously.

Bill Increase by Tariff Type

Here is what that 2,860 kWh of EV charging actually costs on different UK electricity tariffs:

The difference is stark: switching to an EV tariff saves you £450-500 per year compared to charging on a standard rate. See our full tariff comparison for detailed reviews.

But Compare It to Petrol

The electricity increase only tells half the story. You also need to subtract the petrol you are no longer buying:

Even on the most expensive home electricity rate, you save £900+ per year compared to petrol. On a smart tariff, the saving is £1,400-1,600 per year.

Use our interactive savings calculator to see your exact figures based on your mileage.

Bill Increase by Mileage

High-mileage drivers benefit the most from switching to an EV tariff. At 20,000 miles per year, the tariff choice alone is worth £1,000 per year.

The Standing Charge Question

One common concern is whether EV tariffs have higher standing charges that offset the savings. The answer: slightly, but it is negligible.

Most EV-specific tariffs charge around 47-53p per day in standing charges, compared to 45-50p on standard tariffs. That is a difference of roughly £10-15 per year — nowhere near enough to offset the hundreds you save on the unit rate.

How to Minimise Your Bill Increase

1. Switch Tariff First

This is worth more than any other optimisation. Moving from a standard tariff to Octopus Intelligent Go saves £500/year on charging costs alone.

2. Charge Off-Peak Only

Set your charger or car to start charging during the off-peak window (typically 11:30pm-5:30am). A 5-6 hour window adds roughly 35-42 kWh — enough for 120-150 miles of driving.

3. Get a Home Charger

A dedicated home charger charges your car 3-4 times faster than a three-pin plug, and smart chargers can automatically schedule charging for the cheapest hours.

4. Consider Solar

If you have or are planning solar panels, you can charge your EV for free during daylight hours. A 4kW solar array generates enough electricity to cover 5,000-7,000 miles of driving per year at zero marginal cost.

The Bottom Line

An EV adds £200-700 per year to your electricity bill depending on your tariff. But it removes £1,600-1,800 per year in petrol costs. The net saving is £900-1,600 per year.

The cheapest way to charge is on an off-peak EV tariff at 7-8.5p/kWh. If you have not switched yet, that is the single best financial move you can make as an EV owner.

For a full breakdown of every UK tariff by cost per mile, see the UK EV Charging Cost Index.

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