It sounds convincing. Which number is incorrect?
Enough capacity exists
With the first of these, the energy element, the most demand for electricity we’ve had in recent years in the UK was for 62GW in 2002. Since then, due to improved energy efficiency such as the installation of solar panels, the nation’s peak demand has fallen by roughly 16 per cent. Even if the impossible happened and we all switched to EVs overnight, we think demand would only increase by around 10 per cent. So we’d still be using less power as a nation than we did in 2002 and this is well within the range of manageable load fluctuation.
'When' matters, not just 'how much'
More complicated though is the issue of when that power demand actually happens – is it all at once or spread through the day and week?
The traditional evening peak of electricity demand is between 6 and 8pm, and this might well coincide with people returning from their commute and plugging in their cars.
If we want to provide sufficient infrastructure and energy for EVs as cheaply as possible for consumers, we ideally don’t want to add to that evening peak and need to spread that demand better.
With this in mind, recently the Government’s
EV Energy Taskforce recommended that all future car chargers should be ‘smart by design’. This means that no matter what time you come home and plug your car in at, it will charge when you need it but will pause during that evening peak when energy is most expensive and demand on the grid is highest.