Wiener Wasserstoff GmbH is an Austrian company founded in 2020 as a subsidiary of Wiener Stadtwerke, integrating expertise from Wien Energie, Wiener Netze, and Wiener Linien. It focuses on the research, development, production, storage, distribution, and application of renewable hydrogen as an energy carrier to support Vienna's climate neutrality goal by 2040.
The company operates an electrolysis plant in Simmering, producing green hydrogen from renewable electricity for public transport, including hydrogen buses deployed by Wiener Linien, with line 39A fully converted to emissions-free hydrogen operation in December 2025. It manages hydrogen refueling stations in Leopoldau and Simmering.
In May 2026, its Hy4IND project was selected in the European Commission's third Hydrogen Bank auction, receiving support for a 5 MWe low-carbon electrolytic hydrogen facility expected to produce 3,036 tonnes of hydrogen over 10 years at a premium of €0.98/kg.
