Two different process configurations for the production of synthetic natural gas (SNG) starting from woody biomass are proposed and analyzed. Both configurations are characterized by the integration of a two-stage gasifier, a solid oxide electrolysis cell (SOEC) and a methane synthesis reactor. They differ in the size of the SOEC unit: in the first configuration electrolysis directly enhances the syngas produced in order to satisfy the stoichiometric requirement of the methanation reaction, while in the second one it provides to the gasifier the requested amount of gasifying agent (oxygen and steam). For this second configuration, an additional section composed by a water gas shift (WGS) reactor and a carbon capture and sequestration (CCS) unit is required to adjust the reacting gas composition and thus to ensure the proper stoichiometry for the methanation process.