Christian Wystub

Wärme Hamburg GmbH is an investment holding company based in Hamburg, Germany. The German company functions as an investment holding company and is ultimately controlled by the City of Hamburg.

Vattenfall GmbH engages in the management of own and third-party assets, particularly participating interests in firms in the energy sector. Its business activities focus on the production of electricity and heating from energy sources such as wind, water, nuclear power, biomass, coal, and gas. The company was founded on October 28, 1996 and is headquartered in Berlin, Germany.