This paper deals with the possibility of mounting wind turbines on a wave energy plant. The basis is the Poseidon combined wave and wind energy conversion platform. The wave energy part of the Poseidon platform has been tested at sea and a comprehensive measurement campaign has been carried out, measuring platform motion and waves, current and wind conditions. The measurement form the basis for aeroelastic simulations of a wind turbine mounted on the platform. The aeroelastic simulations show that the tower bottom bending moment has increased and extra considerations need to be taken about the turbine tower construction. The specific turbine is found to damp the platform roll motion.