The UK's national electricity transmission operator, the National Grid, has warned that future powerful fast chargers for electric vehicles risk tripping a main fuse if vehicle owners are also utilising other 'high demand' energy items (which would include kettles), given current UK domestic electricity infrastructure.

The warning comes as the UK government has said that fossil fuel burning vehicles will be phased out by 2040. The National Grid has presented a 'thought piece' on the potential challenges that such a switch would have for the energy sector and electricity transmission.

The National Grid assumes that most electric cars will need to have a battery capacity of 90 kilowatt hours (kWh) for drivers to make journeys of about 300 miles on a full charge, in the electric car dominated future.

An 11kW charger could power up a vehicle with a 90kWh battery in six hours if it is already 25 per cent charged, it says, but owners would be unable to boil their kettles during that time without blowing a fuse.

"The average household is supplied with single phase electricity and is fitted with a main fuse of 60-80 amps," added the company.

"If one were to use an above average power charger, say 11kW, this would require 48 amps. When using such a charger it would mean that you could not use other high demand electrical items, without tripping the house's main fuse."

Homes could be fitted with the maximum 100 amp main fuse to accommodate more powerful chargers, the National Grid suggested.

It also said, however, that building several thousand "super fast" charging forecourts — similar to modern day petrol stations — would be preferable "rather than carry out a large scale rebuild of the domestic electricity infrastructure".