The consequences of climate change are becoming ever clearer and the transition to a sustainable economy is becoming a global challenge. With the green hydrogen alliance HY-5, the business development organisations of the federal states of Lower Saxony, Schleswig-Holstein, Mecklenburg-Western Pomerania, Hamburg and Bremen have now visibly positioned themselves on the initiative of IHK Nord and Hamburg Marketing. The aim is to jointly promote northern Germany as the strongest future region for green hydrogen in Europe and to develop solutions along the entire value chain for green hydrogen. Together, the federal states want to create synergies for location marketing and make the region a hotspot on the European hydrogen map.