Reducing CO2 emissions to lower the global warming impact and protect the environment is a central objective of environmental policy. Climate neutrality shall be achieved by 2045 and a cross-sectoral reduction of greenhouse gases is only possible if fossil energy can be replaced by a sustainable alternative. In this context, green hydrogen and its derivatives have a high potential and could contribute to a more sustainable future. The city of Bremerhaven has recognized the potential of hydrogen and is currently establishing itself as a test region for hydrogen production and mobile applications.