Do note that recent advances in electrolytic carbon fixation exceed photosynthesis efficiency when coupled with solar panels. So a multi-story farm building who

Do note that recent advances in electrolytic carbon fixation exceed photosynthesis efficiency when coupled with solar panels. So a multi-story farm building who's roof is clad in solar panels would be able to exceed the output of a farm that directly uses the sun, with no utility hookups. Granted, most nice plants still seem to require some light, but the efficiency advantages over photosynthesis still apply. So maybe use transmissive solar panels to mildly shade the plants, plus hydroponics to deliver the synthetic nutrient solution to them.