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From Paul Barnfather, Chester, UK

Roy Harrison is correct when he states that an electric car has a similar carbon dioxide impact to a petrol-powered hybrid car if the batteries are charged from a gas-fired power station with a carbon footprint of 400 grams per kilowatt-hour (Letters, 6 October). But this is almost never the case.

The UK generation mix now includes a lot of renewables, meaning the average carbon footprint fell from 531g/kWh in 2012 to less than 300g/kWh in 2017. It continues to fall as the use of renewables increases and coal power stations close. See it in real time at .

The result is that an electric car in the UK produces less CO₂ than any petrol-powered hybrid.