Imagine, if you will: You've suddenly lost power, and your electronics are low-energy. There's a number of ways to remedy this, whether it be a hand-crank unit for little things, or a gas generator for big things. Or solar. That works, assuming you've got UV to work with.
In this case, you can take your bicycle and convert it into its own generator. You could get a second rear wheel, strap all this stuff to it, and easily swap your outdoor bike for an indoor exercise bike/power generator.
The more energy solutions you have, the more secure you are. The fact it doubles as an indoor exercise machine just sweetens the deal.