| # | Company | Employees |
|---|---|---|
| 1 |
Grupo Cobragrupocobra.com
Global company with 80 years of experience in industrial engineering and specialized services, present in over 45 countries, focusing on renewable energy and various engineering sectors |
36,000 |
| 2 |
ACCIONAacciona.com
The company specializes in developing regenerative infrastructure with a focus on sustainability, leading the transition to a low-carbon economy with a positive impact on people and the planet |
33,828 |
| 3 |
repsolrepsol.com
A leading player in the oil and gas industry, involved in exploration, production, transformation, development, and marketing of efficient, sustainable energy solutions globally |
26,030 |
| 4 |
Elecnor Groupgrupoelecnor.com
Global corporation specializing in engineering, construction, sustainable projects, infrastructure investments, renewable energy, asset management, and energy transmission across 50 countries. |
10,383 |
| 5 |
Endesaendesa.com
Leaders in electricity and natural gas sector. Providing services to millions of clients. Core business is production, transportation, distribution and commercialization of electric power. |
9,800 |
| 6 |
Moevemoeveglobal.com
Production of sustainable energies based on green molecules like green hydrogen and 2G biofuels, plus ultrafast electric mobility solutions. |
7,527 |
| 7 | 5,553 | |
| 8 |
Naturgynaturgy.com
A multinational energy company with a 180-year history, focusing on renewables, renewable gas, energy efficiency, and circular economy to create value |
4,696 |
| 9 |
GRI RENEWABLE INDUSTRIES SLgri.com.es
Manufactures towers and flanges for the wind energy sector globally, including onshore and offshore towers, wind flanges, and wind castings components. |
4,000 |
| 10 |
Navantianavantia.es
Civil and military shipbuilding, ship repairs, turbine manufacturing, engine production, and weapon systems development with centuries of experience. |
2,977 |
| 11 |
Nippon Sanso Europenippongases.com
A leading European company in industrial and medical gases, offering innovative solutions for various industries, prioritizing safety, quality, and sustainability |
2,106 |
| 12 |
GRUPO ORTIZgrupoortiz.com
Grupo Ortiz is a multinational conglomerate with over 50 years of experience in Construction, Real Estate, Concessions, and Energy sectors, operating nationally and internationally |
2,000 |
| 13 |
ACCIONA Energíaacciona-energia.com
Global leader in renewable energy solutions, focused on decarbonizing the economy through sustainable energy practices to combat climate change and promote community well-being |
1,875 |
| 14 |
ISOLUX CORSANisoluxcorsan.com
A global leader in energy, water, environmental, road, and railways infrastructure, with expertise in energy T&D, solar projects, power plant construction, and parking concessions |
1,746 |
| 15 |
Exolumexolum.com
A European leader in liquid product logistics, specializing in innovative solutions for biofuels, hydrogen, and circular economy to shape the future |
1,650 |
| 16 | 1,535 | |
| 17 |
EDP Renewablesedpr.com
Global renewable energy company specializing in wind power generation with extensive international presence and significant operating capacity. |
1,449 |
| 18 | 1,239 | |
| 19 |
Solarigsolarig.com
Established in 2005, this company offers investment, EPC, and O&M services in the photovoltaic sector globally, focusing on quality and customer satisfaction |
1,217 |
| 20 |
Gestamp Renewablesacekrenewables.com
A leading international industrial group in the renewable energy sector, specializing in manufacturing components and developing wind, solar, and biomass projects |
859 |
| 21 |
Ence - Energía y Celulosaence.es
Leading European eucalyptus cellulose producer and Spain's top renewable energy generator using agroforestry biomass with responsible forest management. |
811 |
| 22 |
Gonvarri Industriesgonvarri.com
Global company specializing in flat steel, aluminium, and metal solutions with seven business units serving diverse industrial needs. |
810 |
| 23 |
EDP Españaedpenergia.es
Global company leading the energy transition with a goal to be 100% green by 2030 Produces over 75% renewable energy and supports a sustainable future |
805 |
| 24 |
Grenergygrenergy.eu
A project developer and Independent Power Producer specializing in solar and wind energy plants' development, construction, operation, maintenance, and sale |
713 |
| 25 | 675 | |
| 26 |
X-ELIOx-elio.com
Develops renewable energy projects, driving businesses and communities toward a sustainable future, with a global, responsible business model for the planet and inhabitants. |
672 |
| 27 |
ENGIE Españaengie.es
Production of renewable energy, energy management, and industrial solutions supporting clients' transition to carbon neutrality and energy efficiency. |
659 |
| 28 |
OW Ocean Windsoceanwinds.com
development, financing, construction, and operation of offshore wind farms delivering reliable, green energy to homes and businesses worldwide |
646 |
| 29 |
Grupo Fertiberiafertiberia.com
A European leader in crop nutrition, biotechnology, green hydrogen, and green ammonia production, committed to achieving net zero emissions by 2035 |
551 |
| 30 |
SUARDIAZ Groupsuardiaz.com
Multimodal logistics group with over 75 years experience, offering comprehensive solutions in Europe, America, and Africa Focused on sustainability and innovation in shipping |
471 |
| 31 |
SIEMSAferrovial.com
Siemsa is an independent operator providing services in the Energy, Industry, and Oil and Gas sectors, specializing in control systems, process analyzers, and innovative Predictive Maintenance solutions |
418 |
| 32 |
Axpo Iberiaaxpo.com
Provider of personalized energy services for large companies, SMEs, and self-employed individuals, with a strong commitment to sustainable and responsible energy solutions |
350 |
| 33 |
Qualitas Energyqualitasenergy.com
Global platform funding and developing renewable energy, energy transition, and sustainable infrastructure assets, with 11 GW portfolio across multiple countries. |
332 |
| 34 |
Endesa Empresas y Ciudadesendesa.com
The company focuses on providing integrated solutions tailored to the needs of individuals, businesses, and public administrations to empower them to take control of their energy consumption |
238 |
| 35 |
Exus Renewablesexusrenewables.com
Manages 7 GW wind, solar, hydro, battery storage assets. Provides firm, flexible, reliable energy solutions across Europe, North America, LatAm. |
227 |
| 36 |
Elawan Energyelawan.com
A global renewable energy company promoting, constructing, and operating wind, solar, and hydroelectric projects with a focus on sustainability and efficiency |
211 |
| 37 | 179 | |
| 38 |
Omexom Spainomexom.es
Specializes in electrical power generation, transmission, transformation, and distribution, offering engineering, construction, and maintenance services, along with data management and mechanical engineering solutions. |
175 |
| 39 |
Zunderzunder.com
Leader in vehicle charging across Spain and southern Europe Provides ultra-fast charging network for electric vehicles, enabling freedom of travel Expanding to France and Portugal |
127 |
| 40 |
HEMAG a TSG Group Companytsg-solutions.com
An experienced group specializing in energy, engineering, electric infrastructure, and healthcare services, known for high-quality solutions and strong communication with clients and employees |
103 |
| 41 | 98 | |
| 42 |
Univergy Solarunivergysolar.com
Specializing in developing and building solar, wind, and green hydrogen projects, including Green H2 solutions Operating in Spain and Japan |
81 |
| 43 |
Celeoceleogroup.com
Identify and manage global investments in power transmission and renewable energy projects, focusing on long-term sustainable value creation in Latin America and Spain. |
72 |
| 44 |
Nidogonido.com
A company focusing on streamlining heat pump installations in residential sectors to transition to clean heating & cooling more affordably and efficiently |
36 |
| 45 |
Grupo Arrategrupoarrate.com
The Group specializes in renewable energy projects, including solar, wind, and biogas, offering consulting services and constructing photovoltaic plants |
19 |
| 46 |
DosGradosdosgradoscapital.com
Develops, acquires, manages sustainable real assets like renewable power, storage, hydrogen, and other natural capital contributors, focusing on the Iberian market. |
17 |
| 47 |
HVR energyhvrenergy.com
Specializing in green hydrogen generation, we develop projects for various industries where electrification is challenging Committed to a sustainable future |
17 |
| 48 |
full&fastfullandfast.com
On-demand mobile recharging solutions for electric vehicles, increasing availability, comfort, reducing operational costs, and saving time needed for the recharge process. |
16 |
| 49 |
DARGON ENERGYdargonenergy.com
Renewable energy projects engineering, development, construction, operation. Solar, wind, offshore, hydroelectric, hydrogen technologies across all stages. |
12 |
| 50 |
Frontier Renewablesfrontier-renewables.com
Global investment management firm focused on renewable energy infrastructure projects accelerating clean energy transition since 2009. Strong diverse team, finance, M&A, engineering experience. |
8 |
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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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