The transition to a hydrogen economy requires appropriate regional planning to take advantage of the each region potential. This paper deals with a first phase of this process. which consists of satisfying around 10% of the energy demand for transport in Spain by 2010 through renewable energy sources. Planning has been carried out via a multiobjective optimization model. The obtained results allow the determination. for each region. of hydrogen production and consumption, the renewable energy Sources used for obtaining this hydrogen, and transport requirements between regions. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.