Top German Companies Powering the Energy Transition
John McCrea, 12 June 2025
The energy transition from fossil fuels to renewables has long been a key point of focus and innovation in Germany, and Europe, and beyond.
However, the reliance on importing gas has brought the debate into starker focus, following Russia’s invasion of Ukraine. Building homegrown energy infrastructure is therefore now a vital objective for European nations, both in terms of energy security and the transition to renewables.
With this in mind, we’ve examined the state of the electricity generation and energy storage industries in Germany, ranking the top 10 companies based on their turnover.
You can find all these figures, and much more, on the Beauhurst platform.
Methodology
Our analysis focuses on German companies in the electricity generation and energy storage industries.
To be included in our list, companies must be headquartered in Germany, listed as ‘Active’ on the German Handelsregister, and be classified within the electricity generation and energy storage industries, using Beauhurst’s industry classification.
Companies have been ranked by annual turnover. Only companies with turnover filed from 31st December 2023 onwards have been included in the ranking.
The data for this report was found using the Beauhurst platform, and is accurate as of 2 June 2025.
The Top German Manufacturing Companies
Top 10 electricity generation and energy storage companies in Germany
10.
Stadtwerke Weinheim
Incorporated: 1997
State: Baden-Württemberg
Latest turnover: €93.7m
Stadtwerke Weinheim provides energy, water, and heat supply services to customers in the Weinheim region — plus waste management and recycling services.
The municipal utility company is also involved in local infrastructure management and supports ongoing energy supply efficiency. In its latest financial filings, Stadtwerke Weinheim reported €93.7m turnover.
09.
BOREAS Energie
Incorporated: 1991
State: Saxony
Latest turnover: €103m
BOREAS Energie is an energy company based in Dresden, Saxony, and was incorporated in 1991. It develops, operates, and manages wind, solar, and biogas power projects across Germany.
The company’s activities include site planning, project financing, and long-term asset operation within the renewable energy sector.
In its latest financial filings, BOREAS reported a turnover of €103m.
08.
Stadtwerke Achim
Incorporated: 1910
State: Lower Saxony
Latest turnover: €105m
Stadtwerke Achim is a municipal utility company based in Lower Saxony. Established in 1910, it provides electricity, gas, water, and heat services to customers in the Achim region.
The company also manages energy distribution infrastructure and local utility operations in the State.
With a turnover of €105m, the Achim-based company — which employs just 92 people — is eighth on our list of German electricity and energy storage companies.
07.
Global Tech I Offshore Wind
Incorporated: 2008
State: Hamburg
Latest turnover: €184m
Global Tech I Offshore Wind is based in Hamburg and was incorporated in 2008. The company oversees the operation of the Global Tech I’s offshore wind farm in the North Sea.
Its activities include energy generation, grid integration, and long-term asset management for offshore wind infrastructure.
The company reported a turnover of €184m in its latest financial filings.
06.
Stadtwerke Ratingen
Incorporated: 1976
State: North Rhine-Westphalia
Latest turnover: €198m
Stadtwerke Ratingen is a regional utility company based in North Rhine-Westphalia. Incorporated in 1976, it supplies electricity, gas, water, and district heating across the Ratingen area.
The company also manages local energy infrastructure and provides support services related to supply and efficiency.
It reported a turnover of €198m in its latest filings.
05.
Greencells
Incorporated: 2009
State: Saarland
Latest turnover: €214m
Greencells is a solar company based in Saarland. Since its incorporation in 2009, the firm has grown into a key provider of utility-scale photovoltaic (PV) systems. The company also delivers solar projects globally, including the management of operations and maintenance for large solar parks.
The company reported a turnover of €214m in 2023.
04.
Iberdrola Deutschland
Incorporated: 2008
State: Berlin
Latest turnover: €359m
Iberdrola Deutschland is the German subsidiary of Spanish utility group Iberdrola. Based in Berlin and incorporated in 2008, the company focuses on renewable energy generation, particularly onshore and offshore wind.
Supporting industrial and commercial clients across Germany with green electricity supply and power purchase agreements (PPAs), the firm also develops large-scale renewable projects and grid infrastructure.
Iberdrola Deutschland reported a turnover of €359m in 2022, making it number four on our list of companies in Germany powering the energy transition.
03.
Contemporary Amperex Technology Thuringia
Incorporated: 2018
State: Thuringia
Latest turnover: €575m
Contemporary Amperex Technology Thuringia is a battery manufacturing company based in Thuringia. Founded in 2018, it operates as the European arm of Chinese battery business CATL.
The company specialises in producing lithium-ion battery cells and modules for electric vehicles and stationary energy storage. Its Arnstadt facility marks CATL’s first manufacturing plant outside China, with a targeted capacity of 14 GWh annually.
With a reported turnover of €575m, the company plays a key role in Europe’s clean energy supply chain and supporting the region’s shift to electrification.
02.
Stadtwerke Gießen
Incorporated: 1969
State: Hesse
Latest turnover: €612m
Stadtwerke Gießen is a publicly-owned German municipal utility company that generates and supplies green electricity to private customers, with a focus on local and sustainable energy production.
With a turnover of €612m, the Gießen-based company — which employs 780 people — is second on our list of German electricity and energy storage companies.
01.
Sungrow Deutschland
Incorporated: 2011
State: Bavaria
Latest turnover: €955m
Sungrow Deutschland develops and manufactures solar inverters, energy storage systems, and electric vehicle charging solutions for residential, commercial, and utility-scale applications.
Based in Munich, Bavaria and employing 114 people, the energy storage company generated €955m in revenue according to its latest financial statement.
