A hot topic at the moment, with skyrocketing home electricity costs across the UK. The cost can vary depending on charging location, as some public charge points are free. An average home charge is £4 for a range of 100miles (depending on your tariff). You could save around £1,400 a year on fuel by switching from petrol to electric if you cover 10,000 miles per year.
A quick guide to working out cost is by multiplying your electricity tariff by your EV battery size. For example (using 15p per kWh as an average UK electricity price):
CarBattery SizeRangeCalculationCost to Charge Nissan Leaf37kWh140 miles15p x 37kWh£5.55 Audi Q4 e-tron 4076.6kWh250 miles15p x 76.6kWh£11.49 BMW iX xDrive 50105.2kWh315 miles15p x 105.2kWh£15.78
Note that the cost above is for the entire battery charge. Most drivers would not charge their car from empty to full regularly, only charging to 80%.
You can also use self-generated electricity (from Solar panels, for example) to charge your EV for free – this is becoming more and more economically viable with solar panels becoming cheaper and electricity increasing in price. Combine Solar panels with battery storage and you could store the electricity generated during daylight hours to use at night.
You can also change Electricity Supplier to one which offers a dedicated EV Tariff, which allows cheap charging at off-peak times (for example 5p per kWh as opposed to 15p per kWh).