An interesting look at the energy capacity of a home biogas digester and what one could power with a small backyard setup.
http://www.motherearthnews.com/renewable-energy/biogas-at-home-zbcz1410.aspx#axzz3I8wK9BOT
This is a companion discussion topic for the original entry at https://peakprosperity.com/biogas-at-home/