"SEWAGE that costs large cities tremendous sums each year can be turned into a source of power equivalent to thousands of tons of coal! The waste now dumped into rivers or shipped to sea may be used to run factories or to light buildings!...The apparatus for producing gas from sewage consists of two sludge digestion tanks in which the sewage is allowed to ferment. The gases given off are composed of from 25 to 75 per cent of methane, or marsh gas." ::Modern Mechanix
Wayback Machine 1922: Poop Power
We recently saw poop power in California, also in Texas, Minnesota and Vermont. Now we learn that it is really old school technology, as this 1922 Popular Science article attests.