Karl Gruber

Wien Energie GmbH engages in the production and supply of electricity and natural gas. Its business activities include the construction and development of solar-, wind-, and hydropower plants, biomass and waste recycling facilities, and cogeneration systems. The company is headquartered in Vienna, Austria.

Cycleenergy Holding GmbH is a holding company, which engages in the construction and operation of biomass and biogas combined heat and power plants. It provides services such as operating, financially structuring, and constructing renewable energy power plants. The firm also supplies electric and thermal energy. The company was founded by Stephan Oliver Schuster in 2006 and is headquartered in Vienna, Austria.