Mackay's book, and this discussion, are in the context of a hypothetical future where Britain is powered predominantly by solar and wind. It's not even that hyp

Mackay's book, and this discussion, are in the context of a hypothetical future where Britain is powered predominantly by solar and wind. It's not even that hypothetical anymore, because as you can see from this dashboard(https://www.energydashboard.co.uk/live https://www.energydashboard.co.uk/live) the UK is currently getting 75% of its electricity from renewable and low carbon sources. So even today, driving 50km there only requires 15kwh of gross energy.