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The joint venture of bp and Iberdrola, Castellón Green Hydrogen S.L., is nearing completion of its 25 MW green hydrogen plant at bp's refinery in Castellón, Spain, marking it as the largest facility of its kind in the country. The project has achieved 90% of the assembly phase and has 100% of its equipment on-site, including an electrolyzer supplied by Plug Power.

The plant is expected to begin testing in May 2026. The investment exceeds 70 million euros, with the electrolyzer powered by renewable energy through a Power Purchase Agreement (PPA) with Iberdrola, producing 2,800 tons of green hydrogen and reducing annual CO2 emissions by 23,000 tons.