The Energy and Cleantech Startup Day is a yearly event where startups and pre-startups in the energy and cleantech sector can explore cooperation potential with established companies and public institutions (technology companies, utilities, municipalities) as well as energy researchers and initiate cooperation and knowledge transfer. Since 2019 contacts to investors are promoted via Investor Speed Dating. In order to bring innovations successfully in the energy sector startups often need the knowledge and resources of established companies, especially energy providers. The incumbents on the other hand receive new impulses for their further development.