GRTgaz is a prominent natural gas transmission system operator based in Bois-Colombes, France. Established in 2005 as a subsidiary of the ENGIE Group, it manages one of Europe's largest high-pressure gas pipeline networks, spanning over 32,500 km. The company plays a vital role in ensuring the security and reliability of the gas supply across France and its neighboring countries, including Germany, Belgium, and Italy.

GRTgaz operates approximately 85% of the French gas transmission network, providing essential services to gas distributors, industrial consumers, and power plants. The company is also involved in cross-border operations through its subsidiary GRTgaz Deutschland, enhancing gas supply across multiple European regions. Committed to sustainability, GRTgaz supports the integration of renewable gases and aims for carbon neutrality by 2050, investing in innovative technologies to facilitate the energy transition.