A method for the generation of a gas mixture comprising carbon monoxide, carbon dioxide and hydrogen for use in hydroformylation plants, and for performing a hydroformylation reaction comprising the steps of: - evaporating water to steam, the method being characterised by the following steps: - in an SOEC step, feeding the steam to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while supplying an electrical current to the cell or cell stack to effect a partial conversion of steam to hydrogen to form a raw product gas from the SOEC or SOEC stack, and - either: - removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid, or - Transferring the raw product gas from the SOEC or the SOEC stack directly to an RWGS reactor without cooling, and - in a RWGS step, utilizing the effluent SOEC gas comprising H 2 together with CO 2 from an external source as feed for a reverse water gas shift (RWGS) reactor in which the RWGS reaction takes place, converting some of the CO 2 and H 2 to CO and H 2 O, - removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid, thereby obtaining a gas mixture comprising CO, CO 2 and H 2; and - in a hydroformylation reaction step, using said gas mixture comprising CO, CO 2 and H 2 for liquid phase hydroformylation utilizing carbon monoxide and hydrogen as reactants, while recycling CO 2 to the RWGS reactor; and - wherein CO 2 is not removed until after the hydroformylation reaction step. - evaporating water to steam, - in an SOEC step, feeding the steam to a solid oxide electrolysis cell (SOEC) or an SOEC stack at a sufficient temperature for the cell or cell stack to operate while supplying an electrical current to the cell or cell stack to effect a partial conversion of steam to hydrogen to form a raw product gas from the SOEC or SOEC stack, and - either: - removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid, or - Transferring the raw product gas from the SOEC or the SOEC stack directly to an RWGS reactor without cooling, and - removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid, or - Transferring the raw product gas from the SOEC or the SOEC stack directly to an RWGS reactor without cooling, and - in a RWGS step, utilizing the effluent SOEC gas comprising H 2 together with CO 2 from an external source as feed for a reverse water gas shift (RWGS) reactor in which the RWGS reaction takes place, converting some of the CO 2 and H 2 to CO and H 2 O, - removing some of or all the remaining steam from the raw product gas stream by cooling the raw product gas stream allowing for condensation of at least part of the steam as liquid water and separating the remaining product gas from the liquid, thereby obtaining a gas mixture comprising CO, CO 2 and H 2; and - in a hydroformylation reaction step, using said gas mixture comprising CO, CO 2 and H 2 for liquid phase hydroformylation utilizing carbon monoxide and hydrogen as reactants, while recycling CO 2 to the RWGS reactor; and - wherein CO 2 is not removed until after the hydroformylation reaction step.