International Fachagentur Nachwachsende Rohstoffe e. V.


Biomass combined heat and power (CHP) stations

If the firing output is of dimensions that make it worthwhile to generate electricity by a steam turbine, an ORC (Organic Rankine Cycle) turbine or a steam motor, then wood fuelled or respectively biomass-fuelled stations are set up as a combined heat and power (CHP) installation.Wood-fuelled CHP plants are frequently in service at wood-processing industry sites – e. g. saw-mills and wood-pellet producers, at manufacturing sites for wood chips, OSB panels, parquet and laminate, as well as production sites for paper, mechanical wood pulp and cellulose. Wood-based residual material not usable in the production processes or better used elsewhere is placed in the biomass installations, to produce electricity, heat and process steam. Surplus electricity is fed into the public power grid. Energy supply companies, cities and municipalities or their respective municipal utility companies have set up numerous wood-fuelled CHP plants in recent years. It is mostly waste/used wood that is burned in the energy supply companies' installations, which in many cases are set up to have electrical capacity levels between 10 and 20 MW. Conversely, in cities' and municipalities' installations are set up for a capacity of < 5 MWel in most cases.  Mainly assortments of forest waste wood and also wood from landscape conservation areas in the region, as well as wood material from municipal properties is used. Via local and district heating networks, the biomass installations' heat is made available to manufacturing, trade and service companies, as well as to housing cooperatives, private households and public buildings.