As regards calorific value, there is no difference between biogas and conventional natural gas. However, while natural gas is a fossil fuel with limited resources, biogas is produced from renewable resources and therefore available in unlimited amounts.
Biogas is generated in a microbiological decomposition process (fermentation) of organic biomass such as maize and manure and mainly contains water, carbon dioxide and methane. The gas mixture can be used as fuel in a block heat and power plant (BHPP) in which an engine drives a generator that generates electric power.
Realizing great CO2 reductions by implmenting CHP systems
The feeding of the power produced in an environmentally friendly manner into the public grid is regulated by the Renewable Energies Act (REA). The act provides for a feed-in compensation which is guaranteed for a period of 20 years and higher than that for conventionally generated electricity. Berliner Energieagentur (BEA) produces biogas for environmentally friendly operation of BHPPs.