The core technology at Pozo Fondón is green hydrogen production through water electrolysis powered by renewable electricity, using water pumped or discharged from the former coal mine workings (La Nalona bocamina). This approach turns a legacy environmental liability—mine water drainage—into feedstock for hydrogen production, aligning with circular economy principles and just transition goals.[1] The plant is designed for 2.5 MW of electrolysis capacity, expandable to 5 MW, and aims to supply hydrogen to industrial users and mobility applications in central Asturias.[1]
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