Data Center Group

Corporate brand

German provider of secure, energy-efficient data center infrastructure, from consulting and planning to construction, high-security products and operations.

Last updated September 26, 2026

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Overview

Data Center Group (DC-Datacenter-Group GmbH) is a German company specialising in data centres and IT infrastructures. Headquartered in Wallmenroth in Rhineland-Palatinate, it develops, produces, plans and sells data centres and high-security products designed to protect IT infrastructures. The company was founded in 2005 as ProRZ Rechenzentrumsbau GmbH in Betzdorf, among others by Ralf Siefen, and has since grown through a series of sister companies, mergers and acquisitions into an integrated provider covering consulting, engineering, construction, products, services and the operation of high-performance data centres. The group's service portfolio is organised into six business areas: Consulting, Engineering, Construction, Products, Services and Solutions. Its offerings range from advisory and planning through physical construction to the operation of high-security data centres and data centre infrastructures. The company is active in edge computing, colocation and enterprise data centres. Its product range includes physical protection solutions such as the fire-resistant micro data centre 'DC IT Safe', prefabricated outdoor container data centres ('DC IT Container'), modular high-security rooms ('DC IT Room') that can be equipped with shielding against espionage ('DC IT Shielding'), data safes for storage media ('DC IT Data Safes') and the 'DC IT Monitoring' system with its 'DC IT Monitoring Agent' for continuous monitoring and analysis of data centre operations. Since 2020, MVV Enamic GmbH of Mannheim, a wholly owned subsidiary of MVV Energie AG, has been a shareholder; in 2021 founder Ralf Siefen sold his shares entirely to MVV Enamic, making Data Center Group a wholly owned subsidiary. The company reported revenue of around EUR 111.5 million in the 2020/2021 financial year with 156 employees. Its managing directors are Ralf Siefen (operational managing director and chairman of the management board), Philipp Riemen (HR and finance) and Markus Böhmer (technology). Besides its main site in the Westerwald, it maintains offices in Berlin, Frankfurt, Cologne and Munich. Data Center Group has been involved in notable projects including data centres in wind farms (Westfalenwind IT GmbH & Co. KG, Paderborn, commissioned 2018), the high-availability data centres of Main DC in Offenbach (2020, a joint venture with EVO and Vantage Data Centers), an IT large-container-based data centre delivered and installed in Ghana (2021) and the 'Green Data Center' at Heidelberg Innovation Park, begun in autumn 2022 and completed at the end of 2023. In 2025 the company acquired 75% of the planning firm GePlan Ingenieure GmbH & Co. KG.

History

Data Center Group was founded in 2005 as ProRZ Rechenzentrumsbau GmbH (stylised proRZ Rechenzentrumsbau GmbH) in Betzdorf, among others by Ralf Siefen, for the construction of data centres and the design of secure IT infrastructure. In 2006 the sister companies SecuRisk GmbH (Wallmenroth) and RZ Services GmbH (Wallmenroth) were founded, and in the same year ProRZ Rechenzentrumsbau moved its registered office to Kirchen (Sieg). In September 2008 RZ-Products GmbH (renamed DC-Products GmbH in February 2023) was founded in Kirchen (Sieg). In November, ProRZ-Group GmbH (stylised proRZ-Group GmbH) was established in Betzdorf as the shareholder of ProRZ Rechenzentrumsbau, RZ Services, RZ-Products and SecuRisk GmbH. In 2010 the company founded ProRZ Rechenzentrumsbau Austria GmbH in Hallein. In January 2013 ProRZ Group was renamed DC-Datacenter-Group GmbH. In the same year ProRZ Rechenzentrumsbau presented a new energy management system that displays the energy consumption of data centres, and ProRZ Schweiz GmbH was founded in the Swiss canton of Zug. At the end of 2014 Data Center Group moved into a new administration and competence centre for consulting, planning, realisation, service and product development on the former site of Lampertz GmbH in Wallmenroth. As of 1 January 2017, ProRZ Rechenzentrumsbau, RZ Services GmbH, SecuRisk GmbH and RZ-IngCon merged into DC-Datacenter-Group GmbH. RZ-Products was initially continued as an independent subsidiary for international sales in the field of high-security construction technology. On 6 February 2024 it also merged into DC-Datacenter-Group GmbH. Through the merger, Data Center Group bundled its business areas for secure IT infrastructures (consulting, planning, structural implementation, high-security products, service and operation of data centres) under one name. In 2020 MVV Enamic GmbH of Mannheim (a wholly owned subsidiary of MVV Energie AG, Mannheim) became a shareholder of the company. In November of the same year, Data Center Group began construction of another major project in cooperation with Netze Duisburg GmbH. In 2021 Ralf Siefen sold his shareholder interests entirely to MVV Enamic. In 2025 Data Center Group acquired 75% of the shares in the planning firm GePlan Ingenieure GmbH & Co. KG. The company is a wholly owned subsidiary of MVV Enamic GmbH, Mannheim. It maintains a fully consolidated subsidiary, DC-Products GmbH, Wallmenroth (100% as of 30 September 2021). Revenue in the 2020/2021 financial year was around EUR 111.5 million, with 156 employees. The managing directors are Ralf Siefen (operational managing director and chairman of the management board), Philipp Riemen (HR and finance) and Markus Böhmer (technology). Besides its headquarters in the Westerwald, Data Center Group has further offices in Berlin, Frankfurt, Cologne and Munich.

2025
Acquired 75% of the shares in planning firm GePlan Ingenieure GmbH & Co. KG.
2024
DC-Products GmbH merged into DC-Datacenter-Group GmbH on 6 February.
2023
RZ-Products GmbH renamed DC-Products GmbH in February.
2021
Ralf Siefen sold his shareholder interests entirely to MVV Enamic.
2020
MVV Enamic GmbH became a shareholder; construction of a major project with Netze Duisburg GmbH began in November.
2017
ProRZ Rechenzentrumsbau, RZ Services GmbH, SecuRisk GmbH and RZ-IngCon merged into DC-Datacenter-Group GmbH as of 1 January.
2014
Moved into new administration and competence centre in Wallmenroth on the former Lampertz GmbH site.
2013
ProRZ Group renamed DC-Datacenter-Group GmbH; new energy management system presented; ProRZ Schweiz GmbH founded in Zug.
2010
ProRZ Rechenzentrumsbau Austria GmbH founded in Hallein.
2008
RZ-Products GmbH founded in Kirchen (Sieg) in September; ProRZ-Group GmbH founded in Betzdorf in November as shareholder of the group companies.
2006
Sister companies SecuRisk GmbH and RZ Services GmbH founded in Wallmenroth; registered office moved to Kirchen (Sieg).
2005
Founded as ProRZ Rechenzentrumsbau GmbH in Betzdorf, among others by Ralf Siefen.

Products and positioning

Integrated provider of secure, energy-efficient and highly available data centers, covering the full lifecycle from consulting and planning to construction, high-security products and operation.

DC IT Safe
Fire-resistant micro data center.
DC IT Container
Prefabricated outdoor container data center, a mobile plug-and-play data center.
DC IT Room
Modular high-security room installed within buildings.
DC IT Shielding
Shielding to protect against espionage.
DC IT Data Safes
Data safes for the protection of storage media.
DC IT Monitoring
Monitoring system with DC IT Monitoring Agent for continuous monitoring and analysis of data center operations.

Recent events

2022.03.15
Reported2022.03.15
DCI and Texas National Bank partner to launch Bankers Lender[7]DCI与Texas National Bank合作推出Bankers Lenderprnewswire.com
Data Center Inc. and Texas National Bank partnered to launch Bankers Lender, a direct digital bank tailored to bankers. They were implementing the project and planned to launch it in April 2022.
2021.10.06
Reported2021.10.06
DCI named among top 100 financial technology providers[8]DCI入选金融科技服务商百强prnewswire.com
Data Center Inc. announced that it ranked among the top 100 technology providers to financial institutions in the 18th annual IDC FinTech Rankings.
2021.09.16
Reported2021.09.16
DCI and DataVisor announce partnership[9]DCI与DataVisor宣布合作prnewswire.com
DataCenter Inc. (DCI) announced a partnership with DataVisor to provide DCI customer community banks with real-time fraud detection and prevention capabilities.

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