Combustion in a gas engine or a small turbine can produce electricity injected into the grid, and often heat cogeneration, but trigeneration (cold production) is possible.
The operating efficiency of a heat-electricity cogeneration is at best 70%, or 30% of losses. The use of heat is often seasonal and requires proximity to users and the creation of a distribution network. It is also possible to provide cold through heat absorption processes.
In the agricultural world, heat can be used for greenhouses (with CO2 enrichment).
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Storage unit of the Güssing biogas plant (Burgenland, Austria)
Aerial view of a mixed photovoltaic power and biogas plant
Storage of digestates (usable as agricultural amendments) of the biomethane production unit (from bio-waste originating preferentially from Berlin households) in operation since 2013.
Biogas is the gas produced by the fermentation of organic matter in the absence of oxygen. It is a combustible gas composed mainly of methane and carbon dioxide. It can be burned at its place of production to obtain heat and electricity or purified to obtain biomethane that can be used as natural gas for vehicles or injectable on the natural gas distribution network.
Anaerobic digestion occurs spontaneously in swamps (marsh gas), rice fields, large tropical reservoirs or hydroelectric dams, landfills containing waste or organic matter (animal, plant, fungal or bacterial). It can be artificially induced in digesters (in particular for treatment of sewage sludge and industrial or agricultural organic waste).