Spanish multi-energy group Repsol has received approval from its Board of Directors to develop its largest renewable hydrogen electrolyser to date, a 150-megawatt (MW) facility in Tarragona representing a total capital investment of approximately €400 million.
The project is being developed jointly with Enagas Renovable—a green molecule developer owned 80 per cent by Hy24 and 20 per cent by Enagas—which holds a 25 per cent equity stake in the venture. Once operational, the plant will produce more than 22,000 metric tonnes of renewable hydrogen annually, primarily supplying Repsol’s Ecoplanta and adjacent refinery units to manufacture renewable methanol and low-carbon industrial products.
The installation is projected to abate up to 250,000 tonnes of carbon dioxide emissions per year and generate approximately 1,000 direct, indirect, and induced jobs across its development phases. Designed to operate exclusively on reclaimed industrial water, the facility also retains technical provisions to inject renewable hydrogen into the natural gas grid and the Spanish Hydrogen Backbone network in the future.
The project has been selected to receive up to €104 million in public grants under Spain’s Hydrogen Valleys programme, promoted by the Ministry for the Ecological Transition and the Demographic Challenge and financed through NextGenerationEU funds. Situated within both the Catalonia Hydrogen Valley and the Ebro Hydrogen Corridor, the Tarragona unit joins Repsol’s large-scale electrolyser developments in Cartagena and near Bilbao, bringing the company’s combined flagship capacity across the three hubs to 350 MW.
Maribel Rodríguez, Repsol’s Director of Renewable Hydrogen, stated that integrating the electrolyser with the Ecoplanta establishes an industrial platform that places Tarragona at the centre of the company’s transformation, enabling the large-scale manufacture of renewable fuels while reinforcing European industrial competitiveness.
Luis Iglesias, Director of Business Development and Hydrogen Operations at Enagas Renovable, noted that expanding the partnership in Tarragona brings green hydrogen production directly to established industrial demand centres, strengthening Spain’s position as a green molecule hub in southern Europe.
As the leading hydrogen producer and consumer on the Iberian Peninsula, Repsol currently operates an annual production capacity of roughly 360,000 tonnes, accounting for 60 per cent of Spain’s output and 4 per cent of total European consumption. In addition to an active 2.5 MW electrolyser operating at its Petronor refinery since 2023, the company is nearing completion on a 10 MW unit at the Port of Bilbao to supply its synthetic fuels demonstration plant with Aramco, alongside a 4 MW electrolyser in Sines, Portugal, to decarbonise polymer manufacturing.
