By Presidential Decree 328/12-12-2000, the company was established under the name “HELLENIC TRANSMISSION SYSTEM OPERATOR S.A.”. The company's objective is to operate, ensure the maintenance and the development of the Electricity Transmission System within the meaning of Article 2 of Law 2773/1999, across the country, as well as its interconnections with neighboring grids to ensure the country's supply of electricity in a sufficient, safe, cost effective and reliable manner.