Grupo HUNOSA (Hulleras del Norte S.A.)

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]

The project includes a photovoltaic plant installed on land from a former HUNOSA open‑pit coal mine in the area of Mieres–Langreo, providing part of the renewable electricity needed for hydrogen production at Pozo Fondón.[1] This PV installation is a key pillar for ensuring that the hydrogen qualifies as green by being produced with renewable power and exemplifies the reuse of degraded mining land for solar energy.

As part of Mine‑to‑H2, ALSA plans to introduce two new interurban bus models that use green hydrogen produced at Pozo Fondón: one equipped with a fuel cell powertrain and the other using hydrogen in direct combustion engines.[1] These buses will operate on routes in the central Asturian area to demonstrate the decarbonization of regional road transport using locally produced renewable hydrogen.[1][7]

Langreo, Principality of Asturias