Third phase of the trial parallel operation of TEIAS prolonged until autumn 2013

Brussels, (PresseBox) - ENTSO-E announces the extension of the third phase of the trial synchronous operation of the Turkish power system with Continental Europe by one year (until autumn 2013).

The decision taken by ENTSO-E TSOs, representing the Continental European synchronous area was based on a technical evaluation of the trial period which previously had been extended to 18 September 2012. The aim of the trial operation is to examine the real behavior of the system, to detect any threats unforeseen by the simulation studies and to identify and implement appropriate countermeasures.

ENTSO-E's Regional Group Continental Europe monitors the performance of the Turkish power system and detects any negative impact it may have on power systems in the region. A range of specific countermeasures have been identified that TEIAS (Turkish Electricity Transmission Corporation) will have to implement under a specific time schedule. Interconnection of the new power system to the synchronous area of Continental Europe is a serious technical challenge requiring intensive, detailed studies and significant adjustments to the Turkish transmission and generation infrastructure in order to meet the technical standards and to ensure stable operation of the interconnected area.


On 18 September 2010 the Turkish power system was synchronized to the interconnected power systems of Continental Europe, marking the start of the parallel trial interconnection as agreed between the Turkish system operator and ENTSO-E's TSOs HTSO, ESO-EAD, Amprion and Tennet GmbH (former Transpower). The parallel operation is achieved by two 400kV lines to the Bulgarian system and by one 400kV line to the Greek system.

This trial parallel operation period is organized in three phases, the first two of which have been completed

- Phase 1: Stabilization Period with no scheduled exchange of energy.
- Phase 2: Physical, non-commercial energy exchanges between the Turkish system operator and respectively the Bulgarian and Greek TSOs in both directions and at both borders. Thus, physical electricity exchange takes place without any trading involved.
- Phase 3: Upon successful completion of phases 1 and 2, limited capacity allocation for commercial electricity exchanges between Turkey and ENTSO-E's Continental Europe Synchronous Area are allowed, according to procedures mutually agreed between Bulgaria, Greece and Turkey, and in line with EU rules and ENTSO-E procedures.

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