HELION, a subsidiary of AREVA in charge of the business unit Hydrogen and energy storage, is deploying for the first time in a French public building, a hydrogen-based energy storage system, the Greenergy BOX (TM). The 50 kWe system is coupled with a photovoltaic farm to ensure up to 45% electrical autonomy and power backup to the building. The safety system and siting measures of the complete hydrogen chain are described. The paper also high-lights the work accomplished with Fire Authorities and Public to gain the acceptance of the project and allow the deployment of four other hydrogen-based green buildings. Crown Copyright (c) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.