The Renewable Energy Hamburg Cluster (EEHH) is an industry network that promotes and supports activities of the renewable energy sector in the Hamburg metropolitan area as well as joint projects and cooperation with other regions in Germany and world wide. The cluster organisation includes more than 300 companies, including manufacturers, grid operators, project developers, agencies and law firms among others. Fields of activity are onshore and offshore wind, solar power, renewable heat, sector coupling and green hydrogen. In cooperation with other public stakeholders, EEHH has set up an ever growing hydrogen network in the Metropolitan Region of Hamburg.