Black Sea Transmission Network

The Black Sea Transmission Network is a project for electric power transmission from Georgia to Turkey.

In 2014, Inter RAO started supplying electricity from Russia to the energy system of Georgia for subsequent sale in Turkey. The supplies became possible after the commissioning of the 400 kV Akhaltsikhe-Borçka interstate power transmission line with a direct current insertion connecting the energy systems of Georgia and Turkey.https://tass.ru/ekonomika/1622445

Russian electricity supplies to Turkey continue to be transported via Georgia. According to Inter RAO, exports to the Turkish market nearly quadrupled in 2025 compared to 2024, reaching 231 million kWh.https://www.rbc.ru/business/09/06/2026/6a26ff579a794783f664a6dahttps://tass.ru/ekonomika/26575221

Technical description The project foresees a rehabilitation and expansion of the existing transmission system. An overhead transmission line with a total length of will be built from the existing Gardabani and Zestaponi substations to the new Akhaltsikhe substation situated at . The line between Gardabani and Akhaltsikhe will be , of which is a rehabilitation of the existing line and will be a new line. The line between Zestaponi and Akhaltsikhe is long, of which is a rehabilitation of the existing line and will be a new line. The 500 kV overhead line will be a single-circuit transmission line.

At Akhaltsikhe substation two back-to-back high-voltage direct current stations, each with a capacity of 350 MW will be installed. A 400 kV AC overhead line will connect it with Borçka substation in Turkey. About of it will run in the territory of Georgia. The first HVDC back-to-back station would be operational in May 2012 and the second one in May 2013. This link will be built by Siemens.

Financing The project is financed by several European finance institutions. The European Investment Bank and the European Bank for Reconstruction and Development lend €80 million both while the German development bank KfW provides €100 million in the form of a grant (€25 million) and a long-term loan (€75 million, €20 million Development Bank of Austria, Oesterreichische Entwicklungsbank (OeEB) risk participation). The project is developed by the Georgian state-owned transmission system operator Energotrans.

Black Sea Transmission Network

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