DESFA was established in April 2007 after the completion of the legal separation of the transmission and trading activities of the Public Gas Corporation (DEPA SA), in accordance with Law 3428/2005 for the liberalization of the natural gas market.
DESFA is responsible and the main operator of the National Natural Gas Transmission System (NNGS) in Greece with the aim to best serve its users with safety, reliability, efficiency and adequacy. In this context, DESFA offers major market players regulated, from RAE, services of the NNGS, as well as non-regulating services, through the important know-how it has developed. 
The recent strategic partnership (2018) with the Senfluga consortium, consisting of the companies Snam, Enagas and Fluxys, enabled the provision of excellent and high-quality services beyond the Greek borders. Contributing decisively to the security of supply and the diversification of supply sources of the wider region, DESFA also facilitates the development of competition in the Greek energy market, while systematically striving for the reduction of greenhouse gas emissions.
Possessing extensive experience as a gas infrastructure operator and being manned with highly skilled personnel, DESFA is a reliable partner in the framework of the ongoing international energy projects in Southeastern Europe.

DESFA’s Network:
•	Total Network Length: 1.454 km
•	6 Operation & Maintenance Centers
•	47 Metering & Regulating stations
•	2 Border Metering Stations
•	2 Dispatching Centers
•	1 LNG Terminal Station
•	1 Compression Station
•	Remote Control and Communication System

Energy

Infrastructure

DESFA SA – Hellenic Gas Transmission System Operator

DESFA SA – Hellenic Gas Transmission System Operator's headquarters in Chalandri, Greece

This department manages and oversees the day-to-day processes involved in production and service delivery.

Operations

The Engineering and Technical Support team at DESFA SA is responsible for ensuring the reliability and efficiency of the National Natural Gas Transmission System. This team conducts thorough inspections and maintenance of gas infrastructure, oversees project control and documentation, and provides expert technical guidance across various engineering disciplines. Additionally, they play a vital role in managing critical operations, implementing innovative technologies, and addressing environmental and safety concerns to support the strategic goals of the company and enhance service delivery.

Engineering and Technical Support

The Operations and Maintenance team at DESFA SA is responsible for ensuring the safe, reliable, and efficient operation of the National Natural Gas Transmission System. This team oversees the maintenance and management of critical infrastructure, including metering stations, dispatching centers, and LNG facilities. They work to optimize operational performance, implement maintenance projects, and support both routine and emergency operations to guarantee the continuous supply of natural gas while minimizing greenhouse gas emissions.

Operations and Maintenance

This department oversees the efficient functioning and upkeep of operational systems and processes.

Operations Management

The Finance and Accounting team at DESFA SA is responsible for managing the company's financial planning, budgeting, and reporting processes to ensure fiscal responsibility and compliance with regulations. This team oversees financial audits, revenue monitoring, and treasury management, while also conducting internal audits to optimize financial performance. By providing strategic financial insights and resource allocation support, they contribute to the overall effectiveness of DESFA's operations within the natural gas transmission sector.

Finance and Accounting

The Legal and Compliance team at DESFA SA is responsible for ensuring that the company adheres to all legal, regulatory, and ethical standards in its operations. This includes managing compliance with energy regulations, overseeing risk management, and providing legal support across various business functions. The team also focuses on corporate governance, environmental, social, and governance (ESG) initiatives, and engages in stakeholder communications to maintain a transparent and responsible corporate image.

Legal and Compliance

The Procurement and Contract Management team at DESFA SA is responsible for sourcing and acquiring goods and services essential for operating the National Natural Gas Transmission System. This includes managing supplier relationships, negotiating contracts, and ensuring compliance with procurement regulations. The team works collaboratively to optimize costs while maintaining service quality, thereby supporting DESFA's mission of reliability and efficiency in the Greek energy market.

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Other teams

Engineering and Technical Support

Operations and Maintenance

Operations Management

Finance and Accounting

Legal and Compliance

Procurement and Contract Management