# The 33 largest energy companies in Greece
Tamtam tracks 33 energy companies headquartered in Greece. This list ranks all of them by number of employees on LinkedIn, led by Metlen, PPC S.A. and Dynacom Tankers Management, Ltd.. Their median headcount is 533. Half of them were founded in 1997 or later. The most common headquarters are Athens (14) and Marousi (2).
The energy sector in Greece is represented by a mix of established companies and newer firms, primarily based in Athens and its surrounding areas. Key players include Metlen, a global industrial and energy provider, and PPC S.A., a leading Greek electric utility. Dynacom Tankers Management and Maran Gas Maritime Inc. specialize in maritime transportation of oil and gas, while GEK TERNA Group focuses on infrastructure and energy production. Hellenic Cables manufactures cables and conductors.
A notable pattern is the concentration of headquarters in the Athens metropolitan area, including Maroussi, Glyfada, Piraeus, and Kifisia. This indicates a central hub for energy-related operations. The companies span various sub-sectors, from traditional utilities and construction to renewable energy and specialized maritime transport, reflecting a diverse energy landscape.
๐ฌ๐ท Greece ยท 33 companies ยท Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Metlen](https://www.tamtam.ai/c/metlen) (metlengroup.com)
Global industrial and energy provider leading the energy transition with integrated utility services and competitive green metallurgy operations on a European and global scale | Metal Ore Mining | ๐ฌ๐ท Maroussi - Athens | 4,179 | 1990 |
| 2 | [PPC S.A.](https://www.tamtam.ai/c/ppc-s-a) (ppcgroup.com)
Leading Greek electric utility in power generation, distribution, and supply, focusing on decarbonization, digitalization, renewables, and customer-centric growth, with significant market presence and assets | Utilities | ๐ฌ๐ท Athens | 2,980 | 1950 |
| 3 | [Dynacom Tankers Management, Ltd.](https://www.tamtam.ai/c/dynacom-tankers-management-ltd) (dynacomtm.com)
Specializing in managing modern and diverse oil tanker fleet, representing a strong presence in global oil industry with state-of-the-art vessels | Maritime Transportation | ๐ฌ๐ท Glyfada | 1,579 | 1991 |
| 4 | [Aktor Group](https://www.tamtam.ai/c/aktor-group) (intrakat.gr)
A leading international infrastructure provider offering construction, photovoltaic parks, quarry management, technical facilities, and project management services with extensive experience and expertise | Holding Companies | ๐ฌ๐ท Athens | 1,546 | 1950 |
| 5 | [GEK TERNA Group of Companies](https://www.tamtam.ai/c/gek-terna-group-of-companies) (gekterna.com)
A leading business group in Greece with a global presence, specializing in infrastructure, energy production, waste management, and real estate development | Construction | ๐ฌ๐ท Athens | 1,476 | 1969 |
| 6 | [AVAX GROUP](https://www.tamtam.ai/c/avax-group) (avax.gr)
A leading Greek construction group listed on Athens Stock Exchange, specializing in infrastructure, MEP works, international projects, real estate, and more | Construction | ๐ฌ๐ท Marousi | 1,254 | |
| 7 | [ฮฮฮฮฮฮ ฮ.ฮ. - HEDNO S.A.](https://www.tamtam.ai/c/hedno-s-a) (deddie.gr)
An independent organization managing electricity distribution for millions of customers through medium and low voltage networks, also overseeing high voltage networks | Oil and Gas | ๐ฌ๐ท Athens | 989 | 2012 |
| 8 | [MARAN GAS MARITIME INC.](https://www.tamtam.ai/c/maran-gas-maritime-inc) (marangas.com)
Specializing in gas shipping, the organization manages LNG and LPG carriers within a diverse fleet, with over 300 professionals supporting a large crew | Maritime Transportation | ๐ฌ๐ท Athens | 848 | |
| 9 | [GasLog Ltd.](https://www.tamtam.ai/c/gaslog-ltd) (gaslogltd.com)
Global provider of LNG shipping services, emphasizing safety, efficiency, and reliability Committed to improving vessel lifecycle and charter processes | Maritime Transportation | ๐ฌ๐ท Piraeus | 814 | 2001 |
| 10 | [Hellenic Cables](https://www.tamtam.ai/c/hellenic-cables) (hellenic-cables.com)
Leading manufacturer of cables, conductors, plastic, and rubber compounds in South-Eastern Europe, with production plants in Greece, Romania, and Bulgaria Exporting to over 50 countries | Appliances, Electrical, and Electronics Manufacturing | ๐ฌ๐ท Athens | 754 | 1950 |
| 11 | [IPTO-Independent Power Transmission Operator](https://www.tamtam.ai/c/ipto-independent-power-transmission-operator) (admie.gr)
This organization in Greece operates as the Transmission System Operator ensuring reliable electricity supply, market operation, and infrastructure development | Utilities | ๐ฌ๐ท Athens | 734 | 2011 |
| 12 | [PPC Renewables - ฮฮฮ ฮฮฝฮฑฮฝฮตฯฯฮนฮผฮตฯ](https://www.tamtam.ai/c/ppc-renewables) (ppcr.gr)
Specializing in renewable energy production, this subsidiary of Greece's largest power generation company focuses on wind, solar, hydro, geothermal, and biomass energy | Renewable Energy Power Generation | ๐ฌ๐ท Athens | 682 | 2006 |
| 13 | [Maran Tankers Management Inc.](https://www.tamtam.ai/c/maran-tankers-management-inc) (marantankers.gr)
Oil tanker shipping unit managing a fleet of bulk carriers, tankers, and LNG vessels Committed to high standards of quality, environmental protection, and safety | Maritime Transportation | ๐ฌ๐ท Athens | 680 | |
| 14 | [Sunlight Group](https://www.tamtam.ai/c/sunlight-group) (the-sunlight-group.com)
Development and production of lead-acid and lithium-ion batteries for industrial mobility, leisure, and renewable energy storage systems worldwide. | Renewable Energy Semiconductor Manufacturing | ๐ฌ๐ท Kifisia | 649 | 1991 |
| 15 | [Ocean Rig](https://www.tamtam.ai/c/ocean-rig) (deepwater.com)
Specializing in offshore drilling services, the company operates advanced drilling units to explore and develop oil and gas resources in deep waters | Wholesale Petroleum and Petroleum Products | ๐ฌ๐ท Athens | 596 | |
| 16 | [EYDAP](https://www.tamtam.ai/c/eydap) (eydap.gr)
Leading Greek provider of water supply, sewerage, and wastewater treatment services for millions of customers with a focus on public health and environmental protection | Utilities | ๐ฌ๐ท Athens | 591 | 1926 |
| 17 | [DESFA](https://www.tamtam.ai/c/desfa) (desfa.gr)
Leading operator of Greece's National Natural Gas Transmission System, providing reliable and efficient services domestically and internationally, focusing on safety and sustainability | Oil and Gas | ๐ฌ๐ท Chalandri | 533 | 2007 |
| 18 | [HERON](https://www.tamtam.ai/c/heron) (heron.gr)
A leader in electricity generation and trading in Greece, also involved in natural gas supply and trading, focusing on sustainable development and green energy | Oil and Gas | ๐ฌ๐ท Athens | 405 | 2000 |
| 19 | [Dorian LPG](https://www.tamtam.ai/c/dorian-lpg) (dorianlpg.com)
A global leader in liquefied petroleum gas shipping, operating a fleet of modern VLGCs with a focus on safe, reliable, and innovative maritime transportation | International Trade and Development | ๐ฌ๐ท Athens | 377 | 2013 |
| 20 | [Angelicoussis Group](https://www.tamtam.ai/c/angelicoussis-group) (angelicoussisgroup.com)
A privately owned group of shipping companies with a large fleet serving oil, gas, and dry cargo markets in a safe and environmentally sustainable manner | Maritime Transportation | ๐ฌ๐ท Kallithรฉa | 372 | 1947 |
| 21 | [Terna Energy](https://www.tamtam.ai/c/terna-energy) (terna-energy.com)
Develops and operates renewable energy projects, holding the largest and most diversified portfolio in Greece, with significant installed capacity and ambitious growth plans. | Renewable Energy Semiconductor Manufacturing | ๐ฌ๐ท Athens | 289 | 1997 |
| 22 | [Artemis ITS](https://www.tamtam.ai/c/artemis-its) (artemis-its.com)
Integrated services provider for telecommunication and energy networks, with expertise in digital network development, renewable energy systems, and smart management software platforms | Telecommunications | ๐ฌ๐ท Vrilissia | 282 | 2008 |
| 23 | [AVIN INTERNATIONAL L.T.D.](https://www.tamtam.ai/c/avin-international-l-t-d) (avin.gr)
Major tanker operator specializing in crude oil and petroleum product shipments, with a strong focus on shipbuilding programs and high-quality service | Maritime Transportation | ๐ฌ๐ท Athens Marousi | 247 | 1977 |
| 24 | [Naftomar Shipping And Trading Co. Ltd. Inc.](https://www.tamtam.ai/c/naftomar-shipping-and-trading-co-ltd-inc) (naftomar.gr)
International leader in LPG shipping and trading, dedicated to understanding client needs, setting high standards in compliance, and fostering strong relationships | Oil and Gas | ๐ฌ๐ท Voula | 184 | 1972 |
| 25 | [nrg](https://www.tamtam.ai/c/nrg) (nrg.gr)
Energy trading and supply business in Greece focusing on reliability, strong customer relationships, competitive prices, and high-quality service in a rapidly evolving market | Oil and Gas | ๐ฌ๐ท Marousi | 183 | 2012 |
| 26 | [LPC S.A.](https://www.tamtam.ai/c/lpc-s-a) (lpc.gr)
A producer and marketer of base and packaged lubricants, trading in petroleum products, focusing on quality, innovation, and environmental sustainability | Oil and Gas | ๐ฌ๐ท Asprรณpirgos | 100 | 1982 |
| 27 | [Former DEDA](https://www.tamtam.ai/c/former-deda) (edaattikis.gr)
A leading gas distribution company driving innovation and sustainability, digitizing energy for safety and efficiency, with a focus on the energy transition | Oil and Gas | ๐ฌ๐ท Lykovrissi | 52 | |
| 28 | [Agroinvest S.A.](https://www.tamtam.ai/c/agroinvest-s-a) (agroinvest.gr)
Greek industrial company in agribusiness, food & bioenergy, trading, processing oilseeds & grains, producing biodiesel, fish feed & compound feed | Food and Beverage Manufacturing | ๐ฌ๐ท Ilioupoli | 43 | |
| 29 | [Rutech S.A.](https://www.tamtam.ai/c/rutech-s-a) (rutech.gr)
Energy sector company providing high-quality products and services, specializing in uninterruptible power supplies, voltage stabilizers, generator sets, and custom solutions for private and public organizations | Appliances, Electrical, and Electronics Manufacturing | ๐ฌ๐ท Tavros | 16 | 2002 |
| 30 | [MC-Chargers](https://www.tamtam.ai/c/mc-chargers) (mc-chargers.com)
Global environmental protection, reduced carbon emissions, high-performance chargers, accessories, electric passenger cars, buses. This company specializes in providing charging solutions for electric vehicles. | Appliances, Electrical, and Electronics Manufacturing | ๐ฌ๐ท Thermi | 13 | 2019 |
| 31 | [RAM EUROPE](https://www.tamtam.ai/c/ram-europe) (rameurope.com)
Specializing in environmental protection, RAM EUROPE manufactures beach cleaning machines, multi-purpose vehicles, and renewable energy products like cotton pelletsยฎ through biomass exploitation | Environmental Services | ๐ฌ๐ท Orchomenos | 5 | 1951 |
| 32 | [ฮคฮฮฃฮฮฃ ฮฮฮฮกฮฮฮฮฮฮ](https://www.tamtam.ai/c/company-paiania) (tasisenergy.gr)
The company provides high-quality services and products in the field of electrical installations, photovoltaic systems, security systems, energy management, and technical training | Renewables & Environment | ๐ฌ๐ท | 3 | 2015 |
| 33 | [A Ilios](https://www.tamtam.ai/c/a-ilios) (grouptheta.com)
A company specializing in energy infrastructure and power plant construction, with a focus on photovoltaic, solar thermal, and wind power plants | Renewable Energy Semiconductor Manufacturing | ๐ฌ๐ท Heraklion | 3 | 2006 |
## 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 12, 2026.
## More company lists in Greece
- [The largest companies in Greece](https://www.tamtam.ai/l/largest-companies-greece) (778)
- [Multinational companies in Greece](https://www.tamtam.ai/l/multinational-companies-greece) (217)
- [Manufacturers in Greece](https://www.tamtam.ai/l/manufacturers-greece) (92)
- [Companies with in-house R&D in Greece](https://www.tamtam.ai/l/r-and-d-companies-greece) (83)
- [Retail chains in Greece](https://www.tamtam.ai/l/retail-chains-greece) (78)
- [Critical infrastructure operators in Greece](https://www.tamtam.ai/l/critical-infrastructure-operators-greece) (73)
- [Consumer goods companies in Greece](https://www.tamtam.ai/l/consumer-goods-companies-greece) (57)
- [Pharmaceutical Manufacturing companies in Greece](https://www.tamtam.ai/l/pharmaceutical-manufacturing-companies-greece) (55)
- [Education providers in Greece](https://www.tamtam.ai/l/education-companies-greece) (54)
- [Companies with a mobile app in Greece](https://www.tamtam.ai/l/companies-with-mobile-app-greece) (50)
- [Corporate groups and holding companies in Greece](https://www.tamtam.ai/l/holding-companies-greece) (49)
- [Public sector organisations in Greece](https://www.tamtam.ai/l/public-sector-organisations-greece) (49)
- [Financial services firms in Greece](https://www.tamtam.ai/l/financial-services-firms-greece) (48)
- [Pharmaceutical companies in Greece](https://www.tamtam.ai/l/pharmaceutical-companies-greece) (48)
- [Food and beverage companies in Greece](https://www.tamtam.ai/l/food-and-beverage-companies-greece) (47)
- [Food and Beverage Manufacturing companies in Greece](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-greece) (44)
- [Distributors and wholesalers in Greece](https://www.tamtam.ai/l/distributors-and-wholesalers-greece) (43)
- [Family-owned companies in Greece](https://www.tamtam.ai/l/family-owned-companies-greece) (41)
- [IT Services and IT Consulting companies in Greece](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-greece) (38)
- [Software Development companies in Greece](https://www.tamtam.ai/l/software-development-companies-greece) (38)
- [IT services companies in Greece](https://www.tamtam.ai/l/it-services-companies-greece) (38)
- [Publicly traded companies in Greece](https://www.tamtam.ai/l/publicly-traded-companies-greece) (37)
- [Logistics companies in Greece](https://www.tamtam.ai/l/logistics-companies-greece) (36)
- [E-commerce companies in Greece](https://www.tamtam.ai/l/ecommerce-companies-greece) (34)
## The same list elsewhere
- [Energy companies in the world](https://www.tamtam.ai/l/energy-companies-in-the-world) (10,502)
- [Energy companies in Europe](https://www.tamtam.ai/l/energy-companies-in-europe) (4,235)
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Source: https://www.tamtam.ai/l/energy-companies-greece