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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Metlenmetlengroup.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 |
4,179 | |||
| 2 |
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 |
2,980 | |||
| 3 |
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 |
1,579 | |||
| 4 |
Aktor Groupintrakat.gr
A leading international infrastructure provider offering construction, photovoltaic parks, quarry management, technical facilities, and project management services with extensive experience and expertise |
1,546 | |||
| 5 |
GEK TERNA Group of Companiesgekterna.com
A leading business group in Greece with a global presence, specializing in infrastructure, energy production, waste management, and real estate development |
1,476 | |||
| 6 |
AVAX GROUPavax.gr
A leading Greek construction group listed on Athens Stock Exchange, specializing in infrastructure, MEP works, international projects, real estate, and more |
1,254 | |||
| 7 |
ΔΕΔΔΗΕ Α.Ε. - 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 |
989 | |||
| 8 |
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 |
848 | |||
| 9 |
GasLog Ltd.gaslogltd.com
Global provider of LNG shipping services, emphasizing safety, efficiency, and reliability Committed to improving vessel lifecycle and charter processes |
814 | |||
| 10 |
Hellenic Cableshellenic-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 |
754 | |||
| 11 |
IPTO-Independent Power Transmission Operatoradmie.gr
This organization in Greece operates as the Transmission System Operator ensuring reliable electricity supply, market operation, and infrastructure development |
734 | |||
| 12 |
PPC Renewables - ΔΕΗ Ανανεώσιμεςppcr.gr
Specializing in renewable energy production, this subsidiary of Greece's largest power generation company focuses on wind, solar, hydro, geothermal, and biomass energy |
682 | |||
| 13 |
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 |
680 | |||
| 14 |
Sunlight Groupthe-sunlight-group.com
Development and production of lead-acid and lithium-ion batteries for industrial mobility, leisure, and renewable energy storage systems worldwide. |
649 | |||
| 15 |
Ocean Rigdeepwater.com
Specializing in offshore drilling services, the company operates advanced drilling units to explore and develop oil and gas resources in deep waters |
596 | |||
| 16 | 591 | ||||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 17 | 533 | ||||
| 18 | 405 | ||||
| 19 |
Dorian LPGdorianlpg.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 |
377 | |||
| 20 |
Angelicoussis Groupangelicoussisgroup.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 |
372 | |||
| 21 |
Terna Energyterna-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. |
289 | |||
| 22 |
Artemis ITSartemis-its.com
Integrated services provider for telecommunication and energy networks, with expertise in digital network development, renewable energy systems, and smart management software platforms |
282 | |||
| 23 |
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 |
247 | |||
| 24 |
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 |
184 | |||
| 25 | 183 | ||||
| 26 | 100 | ||||
| 27 |
Former DEDAedaattikis.gr
A leading gas distribution company driving innovation and sustainability, digitizing energy for safety and efficiency, with a focus on the energy transition |
52 | |||
| 28 |
Agroinvest S.A.agroinvest.gr
Greek industrial company in agribusiness, food & bioenergy, trading, processing oilseeds & grains, producing biodiesel, fish feed & compound feed |
43 | |||
| 29 |
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 |
16 | |||
| 30 |
MC-Chargersmc-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. |
13 | |||
| 31 |
RAM EUROPErameurope.com
Specializing in environmental protection, RAM EUROPE manufactures beach cleaning machines, multi-purpose vehicles, and renewable energy products like cotton pellets® through biomass exploitation |
5 | |||
| 32 |
ΤΑΣΙΣ ΕΝΕΡΓΕΙΑΚΗtasisenergy.gr
The company provides high-quality services and products in the field of electrical installations, photovoltaic systems, security systems, energy management, and technical training |
3 | |||
| 33 |
A Iliosgrouptheta.com
A company specializing in energy infrastructure and power plant construction, with a focus on photovoltaic, solar thermal, and wind power plants |
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 12, 2026.
More company lists in Greece
- The largest companies in Greece 778
- Multinational companies in Greece 217
- Manufacturers in Greece 92
- Companies with in-house R&D in Greece 83
- Retail chains in Greece 78
- Critical infrastructure operators in Greece 73
- Consumer goods companies in Greece 57
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- Education providers in Greece 54
- Companies with a mobile app in Greece 50
- Corporate groups and holding companies in Greece 49
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- IT services companies in Greece 38
- Publicly traded companies in Greece 37
- Logistics companies in Greece 36
- E-commerce companies in Greece 34