33. Emergency electricity supply after brown outs / black outs.
To clarify - power stations need a lot of external power to go back on line after an outage, if that isn't available there are problems. Anecdotally, in a big blackout on the US east coast in the sixties all of the generators in the region crashed; the usual fix in an emergency was to ask MIT (I think) if they were running their own generator, which was a big beast used for very large experiments. In this case, unfortunately, it was also off-line. Eventually they got the system up and running again - by getting the batteries out of every car in the MIT car park and wiring them together to jump-start the MIT generator! Superman could possibly take care of things a little more quickly, by e.g. using heat vision to raise steam for turbines, spinning generators by hand, blowing a gale to turn wind turbines, etc.
Or just fly a few square miles of mylar mirror into space and use reflected sunlight to light up an area until things are fixed...
