@KnowSolution,
It depends on the need. I would start with installing solar panels and even wind-power on your house side, and or roof. If the current is good enough you could make money back on your electrical bill.
Generators ( backups ) are for like if the electrical goes out and you have a fridge.
Then again you might want one built inside that activates automatically if the electricity goes out or even uses a battery source that could be changed while still being active ( but again that might be too much for you ?? ). Like maybe you have a backup electrical heater system in the wall rather then a Propane based system.
For this it would require research.
The most simplest is the typical fuel generator where you put gas inside and then plug your fridge inside of.
...
My opinion are American brands and or do your reading first. Right now I wish I had some solar or wind thingys because the electrical bill is nuts right now.