The minimum level of the gas stocks the holder of the gas transmission system operation licence (the National Gas Transmission Company Transgaz SA) is obliged to have stored in the underground storage facilities by 31 October 2024 The minimum level of the gas stocks the holder of the gas transmission system operation licence (the National Gas Transmission Company Transgaz SA) is obliged to have stored in the underground storage facilities by 31 October 2023 The minimum level of the gas stocks the holder of the gas transmission system operation licence (the National Gas Transmission Company Transgaz SA) is obliged to have stored in the underground storage facilities by 31 October 2021. The minimum level of the gas stocks the holder of the gas transmission system operation licence (the National Gas Transmission Company Transgaz SA) is obliged to have stored in the underground storage facilities by 31 October 2020.