| # | Company | Employees |
|---|---|---|
| 1 |
Nordex Groupnordex-online.com
A global leader in onshore wind turbine development, manufacturing, and servicing, offering high-yield, cost-efficient solutions for sustainable power generation worldwide |
8,463 |
| 2 |
Marquard & Bahls AGmbholding.com
Independent holding company focused on managing energy industry portfolio with long-term growth Emphasizes financial returns, values, sustainability, and corporate culture |
1,946 |
| 3 |
1KOMMA5°1komma5.com
The company aims to make buildings CO2 neutral by providing technology for clean energy, mobility, and heating through solar, heat pumps, and charging infrastructure |
1,274 |
| 4 |
Oiltankingoiltanking.com
A global tank storage logistics company operating across five continents, offering safe, efficient, and reliable infrastructure services tailored to customer needs |
853 |
| 5 |
Hamburger Energienetze GmbHhamburger-energienetze.de
Utilities company based in Hamburg, Germany, specializing in managing the electricity grid and providing power supply services to the area |
828 |
| 6 |
E.ON Grid Solutionseon-gridsolutions.com
An innovative service company for the grid, providing excellent services and data to EON Group customers, serving approximately seven million customers |
730 |
| 7 |
HAMBURG WASSERhamburgwasser.de
Hamburg Wasser is a company dedicated to providing clean drinking water, sustainable wastewater disposal, and energy solutions, seeking motivated individuals to join their team |
644 |
| 8 |
LichtBlick SElichtblick.de
A company committed to achieving zero CO2 emissions, providing green energy solutions for homes and vehicles, promoting climate neutrality, and supporting climate protection projects |
607 |
| 9 |
Transaswartsila.com
Wärtsilä Voyage offers innovative marine products, integrated solutions, and global services with a focus on sustainability, ensuring optimal benefits worldwide |
563 |
| 10 |
Senvionsenvion.com
A leading supplier of onshore and offshore wind energy systems, offering customized solutions for turbines, installation, service, and maintenance worldwide |
500 |
| 11 |
Hamburger Energiewerke GmbHhamburger-energiewerke.de
The company is a 100% city-owned energy provider in Hamburg, committed to shaping the city's energy future, promoting the energy transition, and limiting global warming |
495 |
| 12 |
MB Energymbenergy.com
A leading energy company offering innovative solutions for transportation, heating, and industrial needs Committed to responsible business practices and the energy transition |
407 |
| 13 |
Zeppelin Power Systems GmbHzeppelin-powersystems.com
Zeppelin Power Systems is a leading provider of Cat and MaK engines, offering efficient system solutions and services in various industries worldwide |
373 |
| 14 |
ENERPARC AGenerparc.de
Specialized services in planning, constructing, operating, and marketing solar power plants and energy with technical and commercial expertise. |
352 |
| 15 |
JET Tankstellen Deutschland GmbHjet.de
A subsidiary of Phillips 66, a nationwide company in the energy and mobility sector, providing well-known JET gas stations and ensuring future mobility |
343 |
| 16 |
Skyborn Renewablesskybornrenewables.com
Developing, building, owning, and operating offshore wind farms using fixed-bottom technology in mature markets, with a global pipeline over 20 GW. |
300 |
| 17 |
Encavisencavis.com
A renewable energy producer listed on the German stock exchange, specializing in solar and wind plants across Europe for stable returns and clean energy supply |
213 |
| 18 | 146 | |
| 19 |
Luxcaraluxcara.com
Manages clean infrastructure investments for institutions, acquiring, structuring, financing, and operating portfolios like solar, wind, and EV charging stations across Europe. |
98 |
| 20 |
IKAV Groupikav.com
Manages diverse energy infrastructure assets globally, including renewables and conventional, offering integrated investment solutions for institutional investors. |
92 |
| 21 |
XCHARGE Europexcharge.com
Provider of high-power EV charging solutions including design, manufacturing, software, sales, and maintenance for global energy and fleet operators. |
61 |
| 22 |
IMR Hamburgimr-hamburg.com
The company specializes in constructing new power plants, servicing existing facilities, and providing engineering, prefabrication, and assembly services for the oil and gas industry |
59 |
| 23 |
GEFO Gesellschaft für Öltransporte M.B.H.gefo.com
A Hamburg-based chemical tanker company specializing in oil transportation services |
24 |
| 24 |
CUT POWER AGcut-power.com
Invests in energy efficiency, CO2 reduction in real estate, energy, mobility sectors, builds, operates electric vehicle charging infrastructure, and develops high-power charging networks. |
22 |
| 25 |
Circular Carboncircular-carbon.com
This company specializes in decarbonizing industrial processes using Biomass Waste to produce renewable energy and biochar products, promoting a circular economy |
11 |
| 26 |
Eternal Power GmbHeternal-power.de
Leading in the production and supply of green hydrogen and its derivatives, prioritizing sustainability and innovation in the energy sector |
11 |
| 27 |
Milvio Energymilvio.energy
A family-owned company in Germany and Europe develops sustainable energy projects, specializing in photovoltaic and wind energy They offer full project support from concept to operation |
8 |
| 28 |
H2Energy Solutions GmbHh2energy.solutions
Specializes in promoting green hydrogen production from renewable energy sources to combat climate change and transition to a fully renewable energy system |
3 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 2, 2026.
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