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 24 countries in Europe but also in China, Russia, Belarus, Turkey and the UAE.
CK Asset Holdings Ltd and CK Infrastructure Holdings Limited acquire joint control of ista.
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.
With the foundation of GENEK GmbH &Co KG (company for energy purchase), ista enters the energy market. GENEK combines energy supply with smart metering.
The new branch in Dubai and the engineering office in Thailand strengthen ista's position as a world market leader.
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.
The funds advised by the British financial investor Charterhouse Capital Partners buy ista from CVC.
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.
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.
The funds advised by the british financial investor CVC Capital Partners buy Viterra Energy Services from Viterra AG.
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.
Viterra Energy Services takes over the Spanish company Incatema and the 'Envirotech Utility Management Services' in the USA.
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.
Raab Karcher Energy Services is represented with subsidiaries in practically all European countries.
Raab Karcher Energy Services joins the North American market and expands its activities to Asia by setting up a representative agent in Beijing, China.
Merger of ista and Clorius to form Raab Karcher Energy Services.
Raab Karcher takes over ista.
Clorius is taken over by ista.
ista is set up by Johannes Schultz and Karl Völker in Mannheim (Germany).
ista receives a first patent for heat allocation meters.
Clorius receives its first patent for heat cost allocators.
Clorius is set up in Denmark by Odin and Aksel Clorius.