"Biogas is a combustible gas that is produced by fermenting biomass of any kind. It is produced in biogas plants, where both waste and renewable raw materials are fermented.
The prefix bio refers to the "biotic" way in which it is formed, in contrast to fossil natural gas, and not to its origin from organic farming.
The gas can be used to generate electrical energy, to operate vehicles or to feed into a gas supply network. The methane content is most important for the utilization of biogas, as its combustion releases energy. (Source: https://de.wikipedia.org/wiki/Biogas)
To estimate the utilization for electricity production:
1 ha of maize = approx. 2 kW continuous electrical output
1 ha of grain = approx. 1.5 kW
1 ha grass = approx. 1 kW
Manure from 1 cow = approx. 0.15 kW"
