Ethanol Plant in Farmstead World — building in the game, and what it is on a real farm.
An ethanol plant ferments the starch in corn into alcohol and distils it up to fuel grade.
The grain is not lost in the process: the leftover distillers’ grains are dried and sold back to farms as livestock feed.
Farm facts about ethanol plant
An ethanol plant ferments corn starch into alcohol and distils it to fuel grade, and the leftover distillers' grains go back to cattle as feed. (en.wikipedia.org)