French company HDF Energy has set up a new polymer electrolyte membrane (PEM) hydrogen fuel-cell production plant in Blanquefort, France. The facility is dedicated to manufacturing high-power hydrogen fuel cells for heavy mobility in maritime and rail sectors. To ensure renewable energy supply for testing the fuel cells, HDF Energy opted to install a 500 kW solar power plant on the roof of the factory. The solar project, implemented on a complex sawtooth roof design, involved the installation of 1,149 Trina Solar modules and Sungrow inverters by Eiffage. Despite challenges posed by the weather conditions and roof inclination, the project is expected to be completed soon. The company aims to achieve high self-production and consumption rates, emphasizing sustainability and injecting surplus energy into the grid at competitive prices. The investment in the project remains undisclosed, but the levelized cost of energy (LCOE) is estimated to be between €0.03/kWh and €0.04/kWh over 20 years. With plans to increase fuel cell production, HDF Energy is prepared to scale up its solar power capacity as needed.