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By   membrane separation will not give any strict separation, but partial enrichment. This means that the content of methane in the produced gas may not be suitable for use as vehicle fuel directly. By applying cryogenic techniques, a very clean CH 4 can be achieved. This is favorable if the product should be used for vehicles. At the same time, also CO2 can be separated, which may be of high interest in possible future carbon capture and storage (CCS) plants. A drawback of cryogenic techniques is the equipment costs, which limits the use to large scale plants. The combination of gasification and CHP enables cleaning of the gas from problematic substances that are evaporated and passing with the gaseous phase such as chlorides and metal salts, such as alkali salts. It could facilitate the introduction of biomass and waste in today´s existing CHP plants using fossil fuel-based feed-stocks. Co-combustion with biomass and waste is generally not possible in the

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 requires a