This paper presents the simulation and analysis of a system created by the combination of a wind turbine, an electrolyser and a fuel cell working together in order to provide constant electric energy supply over I year. The entire system is simulated according to two different operation strategies focused mainly on the operation of the electrolyser at either constant nominal operating power or varying from 20% to nominal operation. The different configurations and dimensions of every component of the system are tested. The entire system has been created using TRNSYS 15 software which permits global simulation and behaviour analysis. Using this tool, it is possible to specify the viability based on technical and economic aspects. (c) 2007 Elsevier Ltd. All rights reserved.