Re: electric cars
> I do wonder what happens when the whole world goes to electric power. [...] So who will design, build or maintain the emergency generators of the future
I think we've reached that situation already. Modern large data centres can consume 40MW or more. A 40MW 'generator' is actually a small power station and simply isn't practicable to have sitting around just in case.
The future is not to have backup power at all (beyond redundant supplies into the building) and design systems that are active/active in different data centres around the country, if not globe.