| # | Company | Employees |
|---|---|---|
| 1 |
Wiener Stadtwerke GmbHwienerstadtwerke.at
The company group in Vienna ensures reliable energy, mobility, and public services while actively pursuing a sustainable climate transition with innovative solutions |
15,000 |
| 2 |
ANDRITZandritz.com
A global supplier of plants, equipment, and services for various industries including hydropower, pulp & paper, metalworking, and solid/liquid separation |
14,107 |
| 3 |
ÖBBholding.oebb.at
With 13 million daily passengers and 1,300 freight trains, ÖBB is a leading Austrian employer with over 42,000 employees and 2,000 apprentices |
7,419 |
| 4 | 6,877 | |
| 5 |
Froniusfronius.com
Manufacturing battery charging systems, welding technology, and solar electronics for various industrial and residential applications. Providing advanced power solutions. |
5,001 |
| 6 |
ANDRITZ Hydroandritz.com
Global leader in supplying electromechanical equipment and services for hydropower stations, offering innovative solutions for new and existing plants, and comprehensive maintenance services |
2,545 |
| 7 | 1,935 | |
| 8 |
Wien Energie GmbHwienenergie.at
Largest regional energy provider, supplying two million people with eco-friendly power, cooling, heating, electromobility, and telecommunications. Invests in renewables and electromobility. |
1,557 |
| 9 |
Miba Groupmiba.com
Development and production of critical components for efficient, sustainable energy generation, transmission, storage, and use across various industries worldwide. |
1,538 |
| 10 |
VERBUNDverbund.com
A leading European utility company focused on renewable energy, primarily hydroelectricity, with operations in electricity generation, transmission, trading, and sales |
1,336 |
| 11 |
OMICRON electronicsomicronenergy.com
Development and support of innovative testing and cybersecurity solutions for medium- and high-voltage electric power systems worldwide. |
1,040 |
| 12 |
Salzburg AGsalzburg-ag.at
A Green Tech Company in Salzburg, offering digital solutions in energy, telecommunications, e-mobility, and photovoltaics, with a focus on sustainability and innovation |
877 |
| 13 |
KEBA Groupkeba.com
An international company founded in 1968, specializing in Industrial Automation, Banking and Service Automation, and Energy Automation, with a focus on technological innovations and quality standards |
854 |
| 14 |
ENERTRAGenertrag.com
renewable energy production, operation, maintenance, planning, and construction of integrated power plants and energy systems with community focus |
749 |
| 15 |
Bosch Österreichbosch.at
A leading technology and services company focusing on solutions for connected living, improving people's quality of life worldwide through innovative products and services |
720 |
| 16 |
illwerke vkwillwerkevkw.at
This company has been providing energy for Vorarlberg with a mix of groundedness and visionary ideas for over a century They are a reliable energy provider, sought-after employer, and community partner |
660 |
| 17 | 633 | |
| 18 |
ASTAastagroup.com
A global leader in producing high-quality copper components for high-voltage industries, energy transition, and sustainability, with a focus on innovation and circular economy concepts |
628 |
| 19 |
Wiener Netze GmbHwienernetze.at
A key infrastructure operator in Vienna, specializing in electricity, gas, district heating, and data services, leading the way towards a sustainable future |
625 |
| 20 |
APG Austrian Power Grid AGapg.at
The company is an independent electricity transmission system operator in Austria, responsible for integrating renewable energy and ensuring energy security at market prices |
624 |
| 21 |
Energie AG OÖenergieag.at
Supplies electricity from renewable sources, natural gas, and heat while providing waste management, water supply, and wastewater services as a regional employer. |
535 |
| 22 | 205 | |
| 23 |
SMATRICSsmatrics.com
A leading E-mobility service provider in Austria offering comprehensive solutions including infrastructure, IT services, and customizable charging solutions for various industries |
144 |
| 24 |
BIOGESTbiogest.at
Green energy technology partner offering profitable solutions with close customer relationships, highly qualified employees, project support, and after-sales assistance |
105 |
| 25 |
PowerUP GmbHpowerup.at
Provider of gas engine solutions, maintenance, and repair services in the global market, aiming for more efficiency and reliability with lower costs |
65 |
| 26 |
ÖKOENERGIEoekoenergie.com
Develops, operates, and manages wind farms, photovoltaic plants, and hydroelectric projects. Also runs biomass heating plants and distributes 100% green electricity. |
34 |
| 27 |
STIEBEL ELTRON ÖSTERREICHstiebel-eltron.at
Innovative family-owned company specializing in renewable energy, heating, ventilation, and air conditioning solutions with a focus on environmental sustainability and efficiency |
32 |
| 28 |
Quaint Energyquaintenergy.com
A German company managing the financing and construction of renewable energy projects, with a diverse investor portfolio striving for clean energy worldwide |
3 |
| 29 |
Beletron GmbHbeletron.at
Specializing in business-related services and cutting-edge energy solutions, providing innovative solutions in charging infrastructure, energy management, photovoltaics, and storage technologies with a focus on sustainability |
2 |
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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 Oct 24, 2026.
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