In yesterday’s blog I outlined the case against the battery-powered car and how some are arguing it will always remain a niche vehicle. EU legislation would mean that, by 2020, the average Golf-class car would probably match a battery-powered car in terms of levels of exhaust pollution and not be far away from the average Co2 released in charging a battery-powered car.

The French, however, have other ideas. Early in 2010, I was at an automotive conference in Qatar where Dominique Venet, executive vice president of French power giant EDF, explained just why the French state was holding out such hope for EVs.The key new acronym we’ll all have to learn is WTW – ‘Well to Wheel’.

This is a calculation of the Co2 footprint of the energy chain – from, for example, the extraction of crude oil to the wheels of your car being powered.

According to Venet, charging up an EV via a fossil-fuel fired power station means that the WTW Co2 calculation is between 140g/km and 200g/km, with gas and coal at each extreme.