Arcus acquires Thermomess, almost doubling the Officium sub-metering portfolio

LONDON, United Kingdom (14 March 2024) – Arcus Infrastructure Partners (“Arcus”) is pleased to announce the acquisition of Thermomess Wärmemessdienst AG (“Thermomess”), by its portfolio company, Officium GmbH (“Officium”). 

This acquisition takes Officium’s portfolio to almost 3m devices and over half a million homes served across 14 subsidiaries, making it the sixth largest provider of metering and energy services in Germany, and almost doubles its sub-metering portfolio.

Established in Wasserburg near Munich in 1964 by Hans Busch, Thermomess, is a family-owned business has developed into an innovative, leading company in the heating servicer sector, catering for more than 220,000 individual apartments throughout Germany.

The German submetering market is the largest in Europe, driven by national laws introduced in the 1970s. It is an attractive market, demonstrating stable growth, sticky customer relationships, countercyclical demand, and the ability for submetering businesses to implement above inflation price increases. 

Stefano Brugnolo, Partner at Arcus and board member of Officium, said: “It is a privilege for Officium to become the partner of choice for Thermomess, a business with a 60-year history and such a strong reputation in the market. This new partnership sets a key milestone in the creation of a leading platform to support the decarbonisation of the German real estate market.”

Officium’s Managing Director, Stephan Kiermeyer, added: “We are delighted to welcome Thermomess onboard. The acquisition continues to expand our presence across Germany, especially in Bavaria, Baden-Wurttemberg, and expand the Officium platform to over 530,000 homes and around 2.7 million measuring devices. Our regional structure makes us an ideal partner for our customers across Germany. Additionally, in tandem with our affiliate EINHUNDERT, we can now offer not only the classic submetering service but also photovoltaic systems, tenant energy, competitive metering point operation and much more.”

Michael Busch, Chairman of the Supervisory Board of Thermomess, said: “Our decentralised local structure allows us to remain in close contact to our customers providing individual care and a tailored approach to their needs. By joining the Officium family, we will be able to create even more added value for our customers expanding our offering and reach.”

Mr Busch manages the company along with board members Stephan and Max Busch.

Arcus media contact:

Harriet Saywell-Lee


T: +44 7442 154256

About Arcus

Arcus Infrastructure Partners is an independent fund manager focused solely on long-term investments in European infrastructure. Arcus invests on behalf of institutional investors through discretionary funds and specialist co-investment vehicles and, through its subsidiaries, currently manages investments with an aggregate enterprise value of c. €22bn (as of 31 December 2023). Arcus targets mid-market, value-add infrastructure investments, with a particular focus on businesses in the digital, transport, logistics & industrials, and energy sectors. Further information on Arcus Infrastructure Partners can be found on

About Officium

Officium GmbH is one of the leading, independent metering and energy service providers for the consumption-based recording and billing of water and heat for the housing sector. The portfolio company Officium is mainly active in Berlin, Brandenburg, North Rhine-Westphalia (e.g. Düsseldorf and Duisburg), Lower Saxony, Mecklenburg-Western Pomerania, Saxony-Anhalt (Dessau-Roßlau) and Saxony (Dresden and Chemnitz) and also includes Thuringia and Bavaria (Upper and Lower Franconia and Munich). Customers are primarily small and medium-sized property management companies and private landlords. More than one million measuring units are now catered for. The parent company, Officium, has 14 measuring service providers

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Date joined

June 2022







Karol joined Arcus in June 2022 as a Senior Investment Executive. Prior to joining Arcus, Karol worked in the digital infrastructure origination team at Amber Infrastructure and in the infrastructure principal investments team at Macquarie Capital. Karol is a member of the Digital Origination Team. His infrastructure experience to date has been primarily focused on infrastructure origination.

Karol holds a BA in Accounting and Finance from University of Manchester.

Management roles

  • Head of Energy Sector Team
  • Investment Committee Member