Electric vehicle (EV) owners will be hit by the energy price rise, says the RAC.
It said the cost of a full charge at home for an EV with a 64-kilowatt hour battery will be £33.80 under the new cap which comes into force on 1 October.
That is significantly more than the current price of £18.37 and last winter’s £13.69.
The figures represent the cost when using a seven-kilowatt charger.
EVs have soared in popularity in recent months, ahead of the ban on sales of new petrol and diesel cars and vans in the UK from 2030.
Figures from the Society of Motor Manufacturers and Traders show there was a 50 per cent increase in registrations of pure electric cars during the first seven months of the year compared with the same period in 2021.
RAC spokesman Rod Dennis said: “The impact of the energy price cap increase will certainly be felt by drivers who charge their electric cars at home, with a full charge of a typical family-sized electric SUV costing 84 per cent more from 1 October than it does under the current ap.
“Despite recent falls in the price of petrol and diesel, the cost of charging at home is still good value compared to paying for either fuel, but again underlines just how the rising cost of electricity is affecting so many areas of people’s lives.
“We’re also aware that public chargepoint operators are having no choice but to increase their prices to reflect the rising wholesale costs they’re faced with, which will heavily impact drivers who have no choice other than to charge up away from home.
“The RAC continues to support the FairCharge’s campaign for the Government to cut the VAT rate levied on electricity from public charge points to 5 per cent, to mirror the rate charged on domestic electricity.”