Grid Expansion

Growing demand spurs investments in Turkey’s power system

The power system in Turkey has witnessed record expansion over the past 10 to 15 years. Sustained investments have been made across the power generation, transmission and distribution segments to cater to the rapid rise in the country’s electricity consumption. This trend of heavy investments in the electricity sector is slated to continue in the coming years, fuelled by the country’s projected economic growth. The investment will receive an additional push, given Turkey’s increasing role in the European Network of Transmission System Operators for Electricity (ENTSO-E).

Expanding electricity sector

Turkey stands out in the Southeast European region as it has steadily reported an average annual gross domestic product (GDP) growth of 6 per cent during the decade 2002 to 2012. Since 2013, the growth momentum has lost some steam, with GDP growing at an annual average rate of 3-4 per cent. The upswing in growth since the economic crisis of 2001, often termed as the Turkish miracle, has been a result of firm economic and political reforms targeted at ensuring its membership in the European Union (EU).

Sustained economic growth has fuelled Turkey’s electricity consumption. According to Turkey’s state transmission grid operator, Türkiye Elektrik Iletim A.S (TEIAS), electricity consumption increased at a compound annual growth rate (CAGR) of 5.4 per cent between 2005 and 2014. This was significantly higher than the average consumption growth across Europe, which stood at a CAGR of about 0.7 per cent. The rising demand was met through corresponding growth in the generation capacity. During this period, the generation capacity in the country expanded at a CAGR of 6.7 per cent.

The country’s transmission network has also undergone a substantial change over the past decade in response to the investment efforts made by TEIAS. Between 2005 and 2014, the company invested more than TRY 5.5 billion to add more than 7,800 km of transmission line length, 55,900 MVA of transformer capacity and 471 substations.

Network growth drivers

Growth momentum in the transmission segment is expected to continue in the coming years in response to the increasing power generation, demand and supply. It is estimated that during the period 2016 to 2025, electricity consumption in Turkey will increase at a CAGR of 5.4 per cent, while the overall growth in Europe will be limited to only 1.1 per cent. The high growth is expected to continue in the coming years as about 15 GW of generation capacity will be added in the country during 2016–19, given the projects under construction. In addition, 11.5 GW of generation capacity is likely to be commissioned during 2020-25.

Network investments hold the key to Turkey’s future energy strategy. The country is focusing on harnessing its renewable energy potential so as to reduce dependence on imported natural gas for power generation. The target is to increase the share of renewable energy in the total energy mix to 10 per cent by 2019. The economic viability of the proposed renewable energy projects, especially solar and geothermal, depends critically on the timely availability of evacuation facilities.

Generating additional transmission capacity will also help avoid overloading the existing lines and maintaining grid security. Turkey suffered a major blackout on April 3, 2015, which affected almost every province and was caused by the sudden shutdown of five transmission lines. The grid thus needs to be modernised by integrating information and communication technology so as to ensure uninterrupted and high quality energy supply throughout the country.

Proposed network investments

According to TEIAS’s 2015 Investment Plan, between 2016 and 2020, Turkey plans to add about 13,723 km of transmission lines and 36,400 MVA of transformer capacity. Of this, about 8,186 km of lines and 20,750 MVA of transformer capacity are being developed at the 380 kV voltage levels, while the remaining is coming up at the 154 kV level.

According to recent news reports, the Ministry of Energy and Natural Resources has announced that TEIAS will invest about TRY 10.2 billion between 2016 and 2019 for the development of 14 major transmission projects. Of these, four projects are expected to be completed by the end of 2017. These include the transmission line to connect the Zonguldak power project with the Izmit-Istanbul region and the Osmanca–Ada 2–Pasakoy transmission line. Another 10 projects, which are part of the company’s mid-term action plan, will be completed during 2018 and 2019.

Strengthening interconnections

Cross-border interconnection lines are an important component of the transmission network. Turkey has 11 interconnections with Georgia, Armenia, Azerbaijan, Iran, Iraq, Syria, Bulgaria and Greece. Not all transmission linkages have been operated at the designed ratings or capacity. This has been the case with the interconnections with Armenia, Greece and Bulgaria, where the lines have either not been operated or have been maintained at lower voltages.

Turkey achieved a major milestone in January 2016, when it became an observer member of ENTSO-E, which enables TEIAS to participate in groups and task forces within the association. Earlier, on April 15, 2015, Turkey was permanently connected to ENTSO-E’s continental Europe grid, following a negotiation process and trial synchronisation process that started in September 2010. Turkey’s connection to Europe’s grid will prove to be extremely beneficial for the country, as it will increase import-export opportunities and help improve network reliability. It is estimated that with a permanent connection, Turkey will be able to increase its electricity trade volume with Europe, via Greece and Bulgaria, to about 1,000 MW from the current 550-400 MW. In addition, Turkey will be able to decrease its reserve generation capacity from 900 MW at present to around 400 MW.

Turkey is engaged in the development of several new cross-border lines. This includes the 111 km, 380 kV Van–Sinir transmission line, which will connect the Turkish grid with Iran. The project also includes the construction of a 600 MVA back-to-back direct current converter station at Van in Turkey. Also under construction is a 400 kV transmission link with Iraq. On the Turkish side, the project entails the construction of the 131 km  Gercus–Ilisu–Cizre transmission line. From Cizre, the line will connect to Mosul in Iraq.

Turkey is also planning a new interconnection with Romania. The project will either entail developing a 400 kV high voltage direct current (HVDC) submarine cable link via the Black Sea, or transfer through the Bulgarian network via overhead lines. The construction of another 400 kV transmission line with a DC back-to-back station in Turkey, connecting with Syria, is under consideration. In addition, Georgia’s Energo-Pro is developing the 17 km 154 kV Batumi–Muratli transmission line of 350 MW capacity between Georgia and Turkey. The link is expected to be commissioned in 2016. Turkey is also engaged in a feasibility study of the Azerbaijan–Georgia–Turkey power bridge, which envisages greater interconnection of the high voltage networks of the three countries from a subregional perspective.

Future interconnections in which Turkey is likely to play an important role include the Medgrid and the Black Sea Electricity Ring projects. Some progress has already been made on these projects with the synchronisation of Turkey’s grid with the ENTSO-E system. With this, Medgrid has two routes available for closure – one towards Spain to the west end and the other towards Turkey to the east end. The Black Sea Electricity Ring is a 500 kV HVDC project aimed at stabilising Georgia’s transmission network and facilitating electricity trade among Georgia, other south Caucasus countries and Turkey. Construction of the new 400 kV link between Turkey and Georgia under the Black Sea Regional Transmission Planning project is a complementary part of the Black Sea Electricity Ring project.

Among the other long-term investments is a proposed plan to link the Arab countries through a common power grid. The Arab countries plan to eventually connect the Arab grid to Turkey, which is already linked to the rest of Europe. This will enable both the Arab and the European countries to tap into each other’s energy resources. Studies on how best to create such a unified grid are under way.


The upswing in Turkey’s electricity sector depends directly on the country’s economic growth momentum, which is threatened not only by the possibility of economic stagnation in the Euro zone, but also by political unrest in neighbouring countries. However, the increase in private consumption, stability in inflation, and lower interest rates and production costs are providing the much-needed positive push to the investment scenario.

In the electricity sector, the government has drawn up ambitious plans to augment generation and transmission capacity to cater to the growing power demand. Investments in developing interconnections are only likely to increase as Turkey’s importance in the energy market grows as a regional energy hub.


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