Independent Power Transmission Operator S.A. (IPTO or ADMIE from "ΑΔΜΗΕ" - Ανεξάρτητος Διαχειριστής Μεταφοράς Ηλεκτρικής Ενέργειας A.E. in Greek) is the Transmission System Operator for the Hellenic Electricity Transmission System. It performs the duties of system operation maintenance and development to ensure Greece’s electricity supply.
It is a wholly owned subsidiary of Public Power Corporation of Greece (PPC S.A.); however, since February 2012 it is independent in operation and management, retaining the necessary independence required for compliance with 2009/72/EC EU Directive.
Beginning in 2001, after the review of the Greek energy market, until 31 January 2012, ADMIE was a joint company with the Hellenic Electricity Market Operator S.A. (now called LAGIE S.A. from "ΛΑΓΗΕ" - Λειτουργός Αγοράς Ηλεκτρικής Ενέργειας A.E. in Greek) under the name "Hellenic Transmission System Operator S.A." (HTSO or DESMIE from "ΔΕΣΜΗΕ" - Διαχειριστής Ελληνικού Συστήματος Μεταφοράς Ηλεκτρικής Ενέργειας Α.Ε. in Greek).
As of 30 June 2012, the Hellenic Electricity Transmission System comprised 11.303 km of transmission lines and 291 Substations with a total installed capacity of 50.749 MVA :
ADMIE S.A. is a member of ENTSO-E (the European Network of Transmission System Operators for Electricity).
The Greek Bailout Agreement in July 2015 includes the privatization of ADMIE.
For this purpose, ADMIE is to be split from PPC S.A., with a 51% stake to be transferred to the Greek State and a 49% stake to be sold, including a stake of at least 29% to be offered to strategic Investors.
On 21 October 2016, a consortium formed by Terna S.p.A. and F2i SGR S.p.A. (both with 50% stakes) submitted a binding offer for the acquisition of a 24% stake in ADMIE.