Repsol will install its second 100-megawatt (MW) renewable hydrogen electrolyser at the Petronor industrial complex in Muskiz, near Bilbao in northern Spain, the energy group said.
The project will require an investment of about €292 million and is scheduled to be commissioned in 2029. It has been recognised by the European Commission as an Important Project of Common European Interest and will receive €160 million in support through Spain’s NextGenerationEU recovery funds, Repsol said.
Once operational, the electrolyser will be able to produce up to 15,000 tonnes of renewable hydrogen a year, primarily for use at the Petronor refinery. Repsol said part of the output will also be supplied to regional industry through the Basque Hydrogen Corridor.
The company said the facility is expected to help avoid up to 167,000 tonnes of carbon dioxide emissions annually by supporting industrial decarbonisation.
Repsol described the development as a major technological undertaking and said it is expected to generate around 900 direct, indirect and induced jobs.
The Bilbao-area project builds on Repsol’s earlier hydrogen initiatives at Petronor, including a 2.5-MW electrolyser that began operating in 2023. A separate 10-MW electrolyser under construction at the port of Bilbao is due to start operations in 2026 to supply a synthetic fuels demonstration plant.
Repsol said it approved its first large-scale 100-MW electrolyser at its Cartagena complex in September 2025 and added that it also plans a further 150-MW unit at its Tarragona site to supply its own operations and other nearby industries.
