Yes, this was the intention. using the generator during special times ( night, eclipse, maybe when your other power gens are destoyed). you can produce fuel during the day time ( with solar power ) and use the fuel in the night. the fuel is a bit like a battery i guess. A fulled generator can run for 5 and a half days in the eco mode ( 10 fuel units in the tank and one in the generator, normal mode about 2 till 3 days ). So it can be rational to produce fuel BEFORE you need it and store it for harder times.
Edit: you can also build two generators instead of one, or even more
like this, 4 generators with one fuel tank
Edit: you can also build two generators instead of one, or even more
like this, 4 generators with one fuel tank