Via Texas Tech Today:
If all of the cattle, swine and poultry waste across the United States could be collected and converted to electricity, the resulting energy could produce 80 percent of the nation’s current electrical power needs, while also generating marketable high-end plants and extracts.
And the system works, at least on a smaller scale, according to research by civil engineering professor, Clifford Fedler.
Eighty percent seems like an awfully large number — enough to replace all of the coal, oil, and natural gas fueled generation currently in place — but I can’t find a supporting research article online, so I don’t know what data and assumptions generate that conclusion.
More is explained in this YouTube video: