Going through this myself. Solar would be great some day with batteries, but it is very expensive and they don't last all that long.

Likely route we are going with is a 10kw PTO generator for my tractor (~$2400) and a GenerLink switch at the power meter. No worries about gasoline, carburetors etc.. just use the same tractor I use all the time. While it is not "instant on" when the power goes out, its very efficient diesel, pretty much maintenance free, and relatively cheap.