The major electricity provider in Greece is the Public Power Corporation S.A. The Greek government established the PPC in 1950. Its principal objective was to develop and implement a national energy strategy that would provide all Greek residents with affordable electricity through the use of indigenous resources and products. PPC began integrating all of the minor local grids into the larger, integrated national grid. The business also decided to buy all the small municipal and private electric power-producing facilities.

The Hellenic Electricity Distribution Network Operator (HEDNO or DEDDIE) S.A., PPC Renewables S.A., and PPC S.A. make up the PPC Group today. Even though PPC owns HEDNO S.A. (the Greek DSO), HEDNO S.A. functions autonomously in accordance with L.4001/2011 and the EU Directive 2009/72/EC regarding the organization of the electricity market.

Founded: 1950
Headquarters: Athens, Greece
Website: https://www.dei.gr/el/

Greek-based Motor Oil (Hellas) Corinth Refineries S.A. is a company in the petroleum sector that specializes in trading and refining oil. In southern Europe and the Mediterranean, it is a dominant power in its industry.

On May 7, 1970, Vardis Vardinogiannis and Georgios Paraschos Aleksandridis established Motor Oil Hellas. Its main office is in Marousi, Greece. Vardis J. Vardinoyannis has held the positions of chairman and managing director since 1972. The company employs more than 2,000 people. The business had prospered in spite of the Greek crisis in 2015.

A sizable contract for engineering, procurement, and construction management services was awarded to TechnipFMC by Motor Oil Hellas in 2020. Three new processing units will be part of the new naphtha complex in Greece, which will have a daily capacity of 22,000 barrels (3,500 m3/d). The construction is anticipated to be finished in 2021.

The remaining 35% of Greece's refining capacity is under the management of Motor Oil's Korinthos plant. The Corinth Refinery, Europe's second-largest refiner, is run by the business, as are the oil and gas production and exploration facilities near Cairo, Egypt. It also owns a number of other gas and energy-related companies, including the Avin, Shell, and Cyclon chains of more than 2,000 gas stations across Greece.

Founded: 1970
Headquarters: Marousi, Athens, Greece
Website: https://www.moh.gr/en/

One of the biggest oil businesses in Southeast Europe, Helleniq Energy Holdings Societe Anonyme, was founded in 1958 with the construction of Greece's first oil refinery, Aspropyrgos.

Following a corporate reorganization, it changed from the Public Petroleum Corporation S.A. (Greek: DEP) to its current name in 1998. It is a group of six subsidiaries as well as a number of other businesses over which it exercises varied levels of managerial control.

Thessaloniki, Elefsina, and Aspropyrgos are the three refineries in Greece that Hellenic Petroleum operates; Motor Oil Hellas is responsible for the remaining 43% of the nation's refining capacity. Additionally, OKTA owns OKTA facilities for the marketing and transportation of petroleum products in Skopje, Republic of North Macedonia.

The refineries receive their crude oil from Saudi Arabia, Iraq, Iran, Libya, and Russia. Additionally, the corporation runs about 300 petrol stations in Serbia, Bulgaria, Cyprus, Montenegro, and the Republic of North Macedonia, in addition to about 1700 petrol stations under the BP and EKO brands in Greece. Additionally, it has a network that offers lubricants, jet fuel, LPG, and marine fuels.

Founded: 1958
Headquarters: Athens, Greece
Website: https://www.helpe.gr/en

International seaborne transportation of crude oil and petroleum products is offered by Tsakos Energy Navigation Ltd, a company with its headquarters in Greece. The company's primary business division is the maritime delivery of products connected to liquid energy.

The fleet of the company consists of 70 vessels with a combined weight of more than 7 million dwt, including a mixture of crude tankers, product tankers, and liquefied natural gas (LNG) carriers. It includes handysize, handymax, Aframax, Panamax, LNG carriers, and DP2 shuttle tankers, enabling the company to meet the needs of its clients for the transportation of crude oil and petroleum products internationally.

Founded: 1993
Headquarters: 367 Syngrou Avenue, P. Faliro ATHINA 175 64 Greece
Website: https://www.tenn.gr/