A history with success

The history of our company goes back over 110 years to the foundation of Clorius and ista, the Danish and German pioneers of consumption-based billing of energy and water. We have expanded not only in Germany but also internationally. Today we are represented in 25 countries in Europe but also in China, Brazil, Russia, Belarus, Turkey and the UAE.

  • 2013

    Funds advised by CVC Capital Partners acquire a majority stake in ista. CVC extends its minority stake held since 2007 into a majority. ista’s management retains an interest in the company.

  • 2011

    With the foundation of GENEK GmbH &Co KG (company for energy purchase), ista enters the energy market. GENEK combines energy supply with smart metering.

  • 2009

    The new branch in Dubai and the engineering office in Thailand strengthen ista's position as a world market leader.

  • 2008

    With the merger of ista and EL-ME in Au in der Hallertau in Germany, ista has its own production site for the first time.

  • 2007

    The funds advised by the British financial investor Charterhouse Capital Partners buy ista from CVC.

  • 2006

    Largest acquisition in company history: ista takes over the French market leader Comptage Immobilier Services (CIS) and becomes the undisputed No. 1 in Europe as well.

  • 2005

    Viterra Energy Services changes its name to ista.
    The acquisition of USI Energy Inc. makes ista the market leader in the USA. ista also becomes the No. 1 in Belgium following the purchase of the two companies, ista Belgien SA and Energy Control.

  • 2003

    The funds advised by the british financial investor CVC Capital Partners buy Viterra Energy Services from Viterra AG.

  • 2001

    Viterra Energy Services opens the door to the Scandinavian energy and utility market. Viterra Energy Services continues to expand in the USA, acquiring 100% of the shares in Utiliread Inc., Atlanta.

  • 2000

    Viterra Energy Services takes over the Spanish company Incatema and the 'Envirotech Utility Management Services' in the USA.

  • 1999

    Following the merger of Raab Karcher and Veba Immobilien to form Viterra AG, Raab Karcher Energy Services now operates under the name of Viterra Energy Services.

  • 1998

    Raab Karcher Energy Services is represented with subsidiaries in practically all European countries.

  • 1997

    Raab Karcher Energy Services joins the North American market and expands its activities to Asia by setting up a representative agent in Beijing, China.

  • 1994

    Merger of ista and Clorius to form Raab Karcher Energy Services.

  • 1990

    Raab Karcher takes over ista.

  • 1974

    Clorius is taken over by ista.

  • 1957

    ista is set up by Johannes Schultz and Karl Völker in Mannheim (Germany).

    ista receives a first patent for heat allocation meters.

  • 1924

    Clorius receives its first patent for heat cost allocators.

  • 1902

    Clorius is set up in Denmark by Odin and Aksel Clorius.