The project aims at developing a sustainable, efficient and cost-effective process for the production of renewable fuels to decarbonize the hard to abate heavy and long-distance transport by combining electrolysis and biomass gasification. More in detail, the projects provides a groundbreaking solution by combining an enhanced high temperature solid oxide electrolysis (SOEC) process to a biomass gasification process, exploiting the oxygen co-produced by the electrolyser as an alternative oxidant to air or pure oxygen produced by expensive air separation units. The hydrogen produced by electrolysis is used to increase the H2/CO ratio at the exit of the gasifier, avoiding the need for a water gas shift reaction (WGSR) step and maximising the overall efficiency of carbon conversion to fuel. The use of oxygen/steam in gasification will be implemented on a highly flexible gasifier with the unique feature of a two feed system able to modulate the amount of low and high humid biomasses. The upgrading of the resulting gases will also use oxygen/steam mixture and will be implemented thanks to the development of an innovative system based on multistep oxy-reforming of tar and hydrocarbons inside a gasifier. This process allows to increase the quality and yields of the syngas and to increase the temperature of the exit gas up to 900°C. This gas can be used to heat up the steam and the sweep gas fed to the SOEC, thus reducing its balance of plant (BOP) CAPEX and OPEX cost. The project aimed at developing the whole value chain exploiting the synergies therefore the so-obtained syngas is cleaned from pollutants at moderate temperature, combined with the H2 produced by electrolysis and then converted to renewable fuels. Two processes will be developed dedicated to MeOH and DME will be developed with focus on effect on H2/CO/CO2 ratio on kinetics and effect of pollutants. The fuel will be compliant and will contribute to the 5.5% of sustainable biofuel and RFNBO target in transport defined in the REDIII. Finally, the gasification co-produces a 10-20% of biochar, which stores carbon resulting in negative CO2 emission fuels.