Greece-Bulgaria Interconnection

The project pertains to the implementation of a second interconnecting line between the Systems of Greece and Bulgaria which will take place via an overhead interconnecting 400 kV Transmission Line between the Nea Santa HVC and the Maritsa East Substation.

The line will have a nominal transmission capacity of 2000 MVA and will a total length of 151 km, with around 30 km belonging to Greece and 121 km to Bulgaria.

The new 400 kV interconnecting line of Greece with Bulgaria is an important project of interest for Europe as a whole. 
The project has been included in the Ten-year Network Development Plan (TYNDP) of ENTSO-E since 2012 and is a subproject of the 142:CSE4 cluster which includes an additional three (3)  400 kV TLs within Bulgaria, with common point the Maritsa East 1 Substation. 

It is also included in the EU Projects of Common Interest (PCI) of the Priority Corridor NSI East Electricity (Electricity interconnections of North-South in central and eastern and Southeast Europe) since 2013, as an integral part of the broader respective cluster for the aforementioned PCI 2.7 projects.

Construction on the side of Bulgaria, which has the largest section of the Transmission Line on its territory, started in March 2020.

  • Increase of transmission capacity at the border of the two countries to 800 MW for the Greece to Bulgaria direction and to 1350 MW for the Bulgaria to Greece direction. 
  • Safe movement of the increased power flows at the North-South direction of the Balkan Peninsula.
  • Broaden the adequacy margin.
  • Increase the possibility of further installation of RES units in the northern part of the country.
  • Strengthening of the European transmission system at the eastern border, a region where the 400 kV system is sparse and connection with the extensive system of Turkey is relatively weak, contributing towards the integration of the electricity markets of Europe and Turkey.
Project's Timeline
Estimated completion of project
Completion of contract conclusion process