We lived through hurricane Ike in Galveston, 2008. Previously was considering natural gas powered back up generac unit. After that storm with salt water covering everything, they wouldn't turn back on the natural gas until all at risk pipes had been replaced. Well after the power was back on, as a consideration for type of system you might want.
If I were doing it today, even in Chicago, I'd be looking for a solar system you could use every day, maybe even get some local tax/energy credits. For short term, even tesla "Power wall"