Does Charging an EV Raise Your Electricity Bill?

Yes, charging an EV at home will raise your electricity bill, but usually by far less than the petrol or diesel it replaces. The size of the increase depends on your mileage, your car's efficiency and, above all, the tariff you charge on. On a standard rate of roughly 25 to 28p per kWh a typical driver might add around £30 to £60 a month, while an off-peak EV tariff of around 7 to 10p overnight can cut that to a fraction. Before you buy, it helps to sort the right home setup with a proper EV charging cable so you can charge efficiently overnight.

At a glance: what charging adds to your bill

Figures are approximate. Always check current rates for your own tariff and car.

How much does home charging actually cost?

The honest answer is that it depends on how much energy your battery takes and what you pay per kWh. A rough way to work it out: multiply your battery size by your price per kWh. A 60kWh battery on a standard rate near 27p costs around £16 for a near-full charge, but the same charge on a 7.5p overnight rate is closer to £4.50. Because most drivers only top up rather than run flat to full, real weekly costs are often lower than these headline numbers suggest.

Will an EV tariff really soften the increase?

A dedicated EV tariff is the single biggest lever you have. Suppliers such as Octopus Intelligent Go and OVO Charge Anytime offer cheap overnight windows, often around 7 to 10p per kWh, aimed squarely at EV owners. If you can shift most of your charging into that window, your fuel cost per mile drops sharply. The trade-off is that daytime or peak-rate electricity may cost a little more, so it suits households that can charge while they sleep rather than topping up all day.

Do you need a separate meter or MPAN?

No, you do not need a separate meter or a second MPAN to charge an EV at home. Off-peak EV tariffs are delivered through your existing smart meter, which records when you use energy so the supplier can bill peak and off-peak periods correctly. Some older setups used a separate Economy 7 meter, but modern EV tariffs simply read your half-hourly smart meter data. If you do not yet have a smart meter, most suppliers will fit one before putting you on an EV rate.

How can you keep the added cost down?

The cheapest charging comes from planning rather than kit. A few habits make a real difference:

• Move charging into your off-peak window using the car's or charger's scheduler.
• Charge to around 80% for daily use to protect the battery and avoid slow top-end charging.
• Use a home wallbox or a decent portable charger rather than paying public rapid prices.
• Precondition the cabin while still plugged in so you draw from the grid, not the battery.

Small changes here compound over a year of driving.

Is it still cheaper than petrol or diesel?

For most drivers, yes. Even on a standard electricity rate the cost per mile of an EV is usually lower than a comparable petrol car, and on an off-peak tariff the gap widens considerably. The exact saving depends on your mileage, your old car's fuel economy and current fuel and electricity prices, all of which move around. The key point is that a higher electricity bill does not tell the whole story: you are removing a separate fuel bill from the equation.

Frequently asked questions

How much will my electricity bill go up with an EV?

It varies with mileage and tariff, but many drivers see an increase of roughly £30 to £60 a month on a standard rate. On an off-peak EV tariff the added cost can be far lower. Work out your own figure by multiplying your typical weekly kWh by your price per kWh, and check current rates.

Is it cheaper to charge at night?

Yes, if you are on an EV tariff with an off-peak window. Overnight rates of around 7 to 10p per kWh are common, compared with roughly 25 to 28p on a standard rate. Scheduling your charge to run during that window is the simplest way to reduce what charging adds to your bill.

Do I need a special meter to charge an EV?

No. A standard smart meter is enough for almost all EV tariffs, as it records your half-hourly usage so the supplier can bill peak and off-peak correctly. You do not need a second meter or a separate MPAN. If you lack a smart meter, most suppliers will install one before switching you to an EV rate.

Does a granny charger cost more to run?

No, a 3-pin granny charger uses the same pence per kWh as any other home charging. It is slower, drawing around 2.3kW, so it takes longer, but the total energy to fill the battery is the same. The only difference is time, not the price per unit of electricity you pay.

How do I estimate my charging cost per month?

Take your weekly miles, divide by your car's miles per kWh to get weekly kWh, then multiply by your price per kWh and by roughly four for a month. For example, 200 miles a week at 3.5 miles per kWh is about 57kWh, which at 8p is around £4.50 a week or £18 a month. Adjust for your own rates.

Is public charging more expensive than home?

Yes, usually much more. Public rapid DC charging often runs around 45 to 80p per kWh, several times a cheap overnight home rate. It is worth it for convenience on longer trips, but for day-to-day driving, charging at home on an off-peak tariff is far cheaper. Check current prices, as public rates change often.

The bottom line: charging does add to your electricity bill, but a smart tariff and good habits keep it modest and still well below fuel costs. To dig deeper, read our guide to the best EV tariffs in the UK explained and see how much it costs to charge an EV at home so you can budget with confidence.