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The combination of a CHP plant with gasification of biomass enables a more flexible use of biomass energy resources compared to only combustion. In this way, the possibility to co-generate heat and power and other chemical energy carriers by either combustion of the product gas or by upgrading to a synthesis gas or a specific energy carrier, such as methane, is introduced. By expanding the CHP plant in this way it is possible to compensate for the lower heating demand most of the year, but still have a capacity to produce high amounts of heat for a district heating net when the winters are very harsh.   When the heat load is low the focus is on producing high value fuels like methane from the biomass, while the residual gas with CO+ H2 is burned in the boiler to produce the heat still needed. Production of methane by using this route is an interesting alternative, compared to production from a tar free CO + H2 synthesis gas. This is as the second case requir...