"transmission system operator" means a natural or legal person who carries out the function of transmission and is responsible for operating, ensuring the maintenance of, and, if necessary, developing the transmission system in a given area and, where applicable, its interconnections with other systems, and for ensuring the long-term ability of the system to meet reasonable demands for the transportation of gas;
"upravljavec prenosnega omrežja" pomeni pravno ali fizično osebo, ki opravlja dejavnosti prenosa in je odgovorna za obratovanje prenosnega omrežja, zagotavljanje njegovega vzdrževanja in po potrebi za razvoj le-tega na danem območju, za medsebojne povezave z drugimi sistemi, kjer to ustreza, in za zagotavljanje dolgoročne zmogljivosti omrežja za zadovoljitev razumnih potreb po transportu plina;