GAZ-SYSTEM was established on 16 April 2004, originally as PGNiG – Przesył Sp. z o.o., unbundled from the structures of the Polish Oil and Gas Company (PGNiG). The establishment of the company was driven by the implementation of European regulations obliging gas undertakings to separate the transmission activity from trade and supply, and to enable all market participants to use the transmission infrastructure on equal terms.

In 2005, all shares in the company were transferred to the State Treasury, and on 8 June 2005, the current name was adopted: Operator Gazociągów Przesyłowych GAZ-SYSTEM S.A. The company became an independent transmission system operator responsible for the security and development of the gas transmission infrastructure in Poland.

Another important step was the establishment in 2008 of Polskie LNG S.A., a company responsible for building the first liquefied natural gas (LNG) terminal in Poland.

In 2010, GAZ-SYSTEM was designated by the President of the Energy Regulatory Office as the operator of the Yamal-Europe transit gas pipeline on the territory of Poland.

In 2015, the President Lech Kaczyński LNG Terminal in Świnoujście was commissioned, enabling the receipt of gas by sea from any direction in the world and marking the beginning of a new stage in the diversification of gas supplies to Poland.

In March 2021, following the merger with Polskie LNG, GAZ-SYSTEM became the direct owner and operator of the LNG Terminal in Świnoujście. Subsequently, the company began implementing the terminal expansion program, which included the construction of a third LNG tank, a second jetty, and increasing the regasification capacity of the facility.

In the years 2016–2022, GAZ-SYSTEM carried out the largest investment program in its history, which included the expansion of the national transmission network and the construction of new interconnections.

In May 2022, the GIPL (Gas Interconnection Poland-Lithuania) pipeline was commissioned, connecting the gas systems of Poland and Lithuania and integrating the Baltic states with the European gas market.

A major event was the commissioning of the Baltic Pipe gas pipeline in September 2022. The investment provided Poland with direct access to gas deposits on the Norwegian Continental Shelf and created a new strategic supply corridor with a capacity of up to 10 bcm of gas per year.

In October 2022, the Poland-Slovakia interconnector was also put into operation, opening access to new supply routes from Southern Europe and the Mediterranean region.

In June 2024, GAZ-SYSTEM took over Gas Storage Poland, becoming the owner of the operator of the gas fuel storage system and expanding its operations with another key element of the national energy infrastructure.

In 2025, the company completed the LNG Terminal Expansion Program in Świnoujście, increasing its regasification capacity to 8.3 bcm of gas per year.

In parallel, the company began implementing the program to build Poland's first floating LNG terminal, an FSRU (Floating Storage Regasification Unit), in the Gulf of Gdańsk. In 2025, the construction of the offshore and onshore parts of the project entered the implementation phase, which, upon commissioning at the turn of 2027 and 2028, will provide additional regasification capacity of approximately 6 bcm of gas per year.

At the same time, preparations began for the implementation of the FSRU 2 project, i.e., the second regasification unit in Gdańsk, which will further increase LNG import capabilities and strengthen Poland's position as a regional gas hub. In June 2026, four entities were contracted for long-term access to the services of the FSRU 2 terminal, which confirmed the market demand for new regasification capacities and the validity of further expansion of the LNG import infrastructure in Poland.

Thanks to consistently implemented investments, GAZ-SYSTEM has transformed the Polish gas system from an infrastructure based mainly on supplies from the east into one of the most modern and flexible gas systems in Europe.