Electricity? So the plants are now coal powered instead of solar powered.
Think about how much edible carbon could be made with a single 1500 megawatt reactor. Feeding algae or yeast to chickens or pigs who don’t care what their pelletized feed is made with could make enormous amounts of meat in a very dense area.
Cattle eat grass and more specifically cellulose which their four chambered stomachs and the symbiotic relationship with the rumen organisms turn that cellulose into acetic acid this along with the microbial protein from the bodies of those symbiotic organisms is the primary energy sources in cattle.
The cow is simply a fermentation factory for its microbes to turn cellulose ,nitrogen and water into protein, acetic acid and methane gas. You will immediately appreciate that acetate when hydrated with water is acetic acid this can be feed directly to cattle as their primary energy vector with a nitrogen source such as ammonia or urea cattle can be raised with out a single blade of grass or kernel of corn.
There are yeasts that can turn acetic acid into 60% by dry mass amino complete proteins something that monogastic animals need every day. We are monogastic animals as are pigs and chickens and fish.