Request for Proposals (RFP) for the “Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications” submission date has been postponed to 18.03.2026 at 10:30 as a result of the issued addendum.

ADDENDUM - REQUEST FOR PROPOSAL - Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications

As a result of the evaluation of the firms that submitted an Expression of Interest under the Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications, the shortlist has been established as shown below.<figure class="table"><table><tbody><tr><td style="border:1.0pt solid windowtext;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">Leader(Name and Nationality)</td><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:none;border-right-style:solid;border-top-style:solid;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:156.05pt;">Members of the JV (if any) (Name and Nationality)</td><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:none;border-right-style:solid;border-top-style:solid;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.9pt;">Sub-Consultant (if any) (Name and Nationality)</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">AtkinsRealis Inc. (Canada)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:148.9pt;">-</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">CESI S.p.A. (Italy)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;vertical-align:top;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:148.9pt;">Eltem-tek Elektrik Tesisleri Muhendislik Muteahhitlik Danismanlik ve Ticaret A.S. (Türkiye)</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">Elia Grid International (EGI) (Belgium)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;vertical-align:top;width:148.9pt;">MRC (Türkiye)</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">Manitoba Hydro International Ltd. (MHI) (Canada)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:148.9pt;">-</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">RTE International (France)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:148.9pt;">EPRI (The Electric Power Research Institute) (United States) &amp; MRC (Türkiye)</td></tr><tr><td style="border-bottom-style:solid;border-color:windowtext;border-left-style:solid;border-right-style:solid;border-top-style:none;border-width:1.0pt;padding:0cm 5.4pt;vertical-align:top;width:148.65pt;">Siemens Energy Global GmbH &amp; Co. (Germany)</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:156.05pt;">-</td><td style="border-bottom:1.0pt solid windowtext;border-left-style:none;border-right:1.0pt solid windowtext;border-top-style:none;padding:0cm 5.4pt;width:148.9pt;">-</td></tr></tbody></table></figure>Request for Proposal documents have been sent to the shortlisted firms, and the proposals will be opened on 04 March 2026 at 10:30 a.m. at the Meeting Hall of the Trade Department.

REQUEST FOR PROPOSAL-Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications

Terms of Reference for Consultancy Services for HVDC Transmission Facility are provided below.&nbsp;

Terms of Reference for Consultancy Services for HVDC Transmission Facility

Environmental and Social Management Framework Document for the Additional Finance for the Renewable Energy Integration Project (REIP) Supported by the World Bank in Türkiye

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Integrated Management Policy

As Turkish Electricity Transmission Corporation (TEİAŞ), we have a long history based on the Turkish Electricity Authority, which was founded in 1970 and we're moving towards bigger goals more decisively, proud of leaving behind the years full of achievements since 2001 that we started our journey under the name of TEİAŞ.&nbsp;With our strong heritage that we received from the past, we operate the electricity transmission system and network of Türkiye at international standards, in a good quality and economical and reliable manner.&nbsp;While expanding our electricity transmission infrastructure each day in parallel with the developments in the energy need, we cross the mountains and deep straits that are difficult to overcome with our electricity transmission lines and we 24/7 transmit Türkiye’s energy all over the country with our 18.000 employees, 22 regional directorates and 10 load dispatch centers.&nbsp;Today, while taking firm steps with the vision of being a leading system and network operator compatible with our country's national energy policies and integrated into international energy markets, we are continuously making contributions to the economy of our country with our strong financial structure and qualified expert staff.&nbsp;We have great goals for the coming period. Within the framework of our agreement with the first nuclear power plant of our country, we will connect the produced energy to our electricity transmission system. In this context, we started the construction works of 6 high voltage lines.&nbsp;As TEİAŞ, with my colleagues, we will continue our services for the bright future of our country and continue being the “Power of Energy”.&nbsp;Best regards,&nbsp;Orhan KALDIRIM Chairman of the Board General Manager

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Message from our General Manager

An agreement for a 750 million dollar loan was signed between our corporation and the World Bank for the "Transmission System Transformation" project.&nbsp;&nbsp;This significant step, which will make our country's energy future more reliable and efficient, was taken in the presence of the Honorable Minister at the 11th Energy Efficiency Forum and Exhibition held on October 6-7 at the Istanbul Congress Center.

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750 Million Dollar Agreement Signed Between Our Corporation and the World Bank

On the second day of the 11th Energy Efficiency Forum and Exhibition, held on October 6-7 at the Istanbul Congress Center, our Deputy General Manager, Mr. Deniz Coşkun, was among the speakers on the highly-attended panel titled "Redesigning the Energy System: Energy 2.0." Mr. Deniz Coşkun evaluated critical topics such as the transition to renewable energy sources, the digitalization of energy grids, and our corporation's role in this process.

Our Deputy General Manager, Mr. Deniz Coşkun, Spoke at the Panel within the 11th Energy Efficiency Exhibition

Under the auspices of our Ministry, we participated in the 11th Energy Efficiency Forum and Exhibition, held on October 6-7 at the Istanbul Congress Center.&nbsp;&nbsp;At this event, which is of critical importance for Turkey's energy future, we shared our role in national energy transmission and our efforts in the field of energy efficiency. We met with industry stakeholders to evaluate the steps to be taken for an efficient and sustainable energy system.

Our Corporation Participated in the 11th Energy Efficiency Forum and Exhibition

A workshop titled “Towards an Integrated Euro-Mediterranean Electricity Market: Overcoming Technical and Policy Barriers” was held on May 27, 2025, in Antalya, hosted by the Energy Market Regulatory Authority (EMRA) and Turkish Electricity Transmission Corporation (TEİAŞ), in collaboration with the Association of Mediterranean Energy Regulators (MEDREG) and the Mediterranean Transmission System Operators (Med-TSO).The event brought together key stakeholders including representatives from MEDREG, Med-TSO, the European Commission, General Secretariat of the Arab League, and other major sectoral institutions. Topics discussed included cross-border interconnections, the integration of renewable energy, and the development of a harmonized regulatory framework.Co-financed by the European Union, the workshop reaffirmed MEDREG and Med-TSO's shared commitment to building a compatible and sustainable Mediterranean energy system. Emphasis was placed on strengthening regional electricity connections to enhance grid stability, integrate renewables, and improve energy security across the Mediterranean.The opening speech was delivered by TEİAŞ Chairman and General Manager Mr. Orhan KALDIRIM. Among the prominent attendees were EMRA President Mr. Mustafa YILMAZ, European Commission Director General for the MENA region Mr. Stefano SANNINO, Med-TSO President Mr. Sabah MASHALY, and MEDREG Director Mr. Hasan ÖZKOÇ.

Strengthening Energy Cooperation in the Mediterranean

During the 11th Southern Gas Corridor Advisory Council and the 3rd Green Energy Advisory Council Ministerial Meeting, held on April 4, 2025, in Baku, Azerbaijan, an Operational Agreement was signed between TEİAŞ and AZERENERJI, Azerbaijan's electricity generation and transmission company.With this agreement, electricity trade opportunities between Türkiye and Nakhchivan have begun.

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Operational Agreement Signed Between TEİAŞ and AZERENERJI

Within the scope of the visit of the Uzbekistan Delegation to our Corporation, an experience sharing meeting was held at the General Directorate of our Corporation under the chairmanship of our Deputy General Manager, Mr. Deniz COŞKUN, on 15 October 2024, with the participation of our Ministry, EÜAŞ and TEMSAN officials.&nbsp;In addition to the delegations of the Ministry of Energy of the Republic of Uzbekistan and the Ministry of Economy and Finance, officials of the O'zbekgidroenergo company also attended the meeting. Following the opening speech of our Deputy General Manager, Mr. Deniz COŞKUN, a presentation was made about EÜAŞ by an EÜAŞ official, and a presentation was made by an official of our Corporation on the integration of renewable energies into the transmission system, and the questions of the Uzbekistan side on the subject were answered. Following the meeting, a visit to the National Load Dispatch Center was made.

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The Republic of Uzbekistan Ministry Delegation and O'zbekgidroenergo Company Officials Visited Our Corporation

The delegation consisting of Ambassador of the Republic of Sudan Mr. Nadir Yousif ELTAYEP, Sudan's Ministry of Energy and Petroleum and Sudanese private company officials visited our Corporation on 14 October 2024 to evaluate cooperation in the field of electrical energy transmission.&nbsp;&nbsp;Following the opening speech made by Deputy General Manager Mr. Deniz COŞKUN, Sudanese officials provided information regarding Sudan's electricity transmission network and projects, pointed out the importance of our Corporation's experiences, especially in the field of electricity transmission, and requested our support in sharing experience.&nbsp;A contact point has been determined by our Corporation to take steps in this context, and it has been communicated that the necessary work can be initiated in close coordination with Sudan.

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A Cooperation Meeting Was Held Between The Delegation of The Republic of Sudan and Our Corporation

The 63rd Board Meeting of the Coordinated Auction Office in South East Europe (SEE CAO), of which our organization is among the partners, was held in Ankara on 10 October 2024.&nbsp;In addition to TEİAŞ, representatives of transmission system operators from Albania (OST), Bosnia and Herzegovina (NOSBİH), Montenegro (CGES), Kosovo (KOSTT), Croatia (HOPS), Macedonia (MEPSO), Greece (IPTO) and officials from the SEE CAO office attended the meeting.&nbsp;Within the scope of the meeting, the chairman and deputy of the SEE CAO board of directors, who will serve for the next 2 years, were determined. Serhat METİN, Head of Planning and Investment Management Department, was elected as the new president of SEE CAO by receiving the majority of the votes. In addition, at the same meeting, Foreign Relations Manager H. Mehmet KARA was appointed as the 9th member of the Board of Directors of SEE CAO. H. Mehmet KARA will hold this position for 1 year.

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Serhat Metin, Our Head of Planning and Investment Management Department, Was Elected As The Chairman of The Board of Directors of SEE CAO

A signing ceremony for the Observer Membership Agreement with ENTSO-E was held at the ENTSO-E Headquarters in Brussels, the capital of Belgium, on 13 December 2022. The Observer Membership Agreement will be valid for a period of three years, effective January 1, 2023.With this agreement, the European Transmission System Operators express their commitment to continue to fulfill their responsibilities to strengthen and develop cooperation in interconnected power systems and with it to keep the lights on at all times in Europe and beyond.Chairman of the Board of Directors and General Manager of our Corporation, Mr. Orhan KALDIRIM, at the ceremony, "underlined the positive contribution of TEİAŞ to the stability of the Continental Europe synchronous area and expressed his wishes for the Agreement to further develop the technical and operational cooperation between ENTSO-E and TEİAŞ."ENTSO-E President Mr. Herve LAFFAYE congratulated everyone working on the Agreement with the signing of the Observer Membership Agreement, which will strengthen cooperation and support the sharing of best practices to maintain transmission system stability.

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ENTSO-E Observer Membership Agreement Signed

CIGRE 49th Paris Session, organized biennially, was held in Paris/France between 29 August and 2 September 2022 with over 3500 participants from 90 countries.TEİAŞ took its place in the event where our country was represented by the Türkiye National Committee. In the 49th Session, where all papers were presented as posters according to the format of the event, 6 previously accepted papers were presented on behalf of Türkiye.&nbsp;TEİAŞ personnel, who is among the authors of the papers, made the presentation of 4 papers. Titles of papers &nbsp;and presenters are below:"Cycle life assessment of battery energy storage systems for primary frequency control by rainflow counting algorithm” by Ercüment ÖZDEMİRCİ&nbsp;"Site Application of Anti Torsion Pendulum and Interphase Space for the Prevention of Ice Load on Transmission Line Systems in Turkey" by Mete UZAR&nbsp;"Electromagnetic interference investigation of two transmission lines with a naturfal buried gas pipeline: A study on the Agrı-Horasan region in Turkey" &nbsp;Özgür ÇETİN and"A Research on Power Quality of Storage System in Photovoltaic Energy Generation Systems in Distribution Networks" by Halil İbrahim AYDINÖZ&nbsp;In addition, TEİAŞ personnel attended various meetings and a presentation was made by Özgür ÇETİN at the B2 Transmission Lines Working Group.CIGRE Türkiye National Committee hosted SEERC Management Board (MB) and Technical Advisory Committee (TAC) meetings hosted by the Turkish Embassy in Paris, and a reception was given after the meetings.Active participation was ensured on behalf of TEİAŞ and CIGRE Türkiye National Committee in this global event of the sector, which brought together leading company officials, academics and experts in the field of electrical power systems from all over the world.

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TEİAŞ Took Place at the 49th CIGRE Paris Session

The National Load Dispatch Center has the most important function in ensuring the real-time generation-consumption balance by maintaining the security and supply quality of the national energy generation and transmission system and operating the 400 kV transmission system that forms the main backbone of the network and operating the balancing power market and real-time ancillary services market.Regional Load Dispatch Centers mainly carry out 154 kV transmission system operation, maneuver, data collection and evaluation activities.Within the scope of load dispatch operation, electricity supply and demand is balanced in real time, the Balancing Power Market and Ancillary Services Market are operated, operational planning is carried out, international interconnection lines are operated, faulty situations and planned work maneuvers are carried out, short-term energy planning is made, daily operation programs and load frequency control are performed, N-1 analyzes are carried out to establish system security.

Yük Tevzi Merkezi | TEİAŞ

We 24/7 operate the electricity transmission system of our country with the National Load Dispatch Center and 9 Regional Load Dispatch Centers.

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Load Dispatch Control Centers

Mobile Substations are of great importance for Türkiye's energy supply security. It can quickly meet the energy requirement in the region in case of a natural disaster or maintenance-failure of the SubStations in the operation. There are 12 mobile Substations in our company.Long processes are required to establish fixed Substations in the energy sector. In addition, with the migration waves, rapid increases can occur in energy requirement. Mobile Substations are portable substations with 154 / 33.6 kV 50 MVA power and capable of meeting the energy requirement of a medium-sized city. The mobile SubStations that are put into service weigh 150 tons and are 27 meters long. They are transported by a special trailer with high maneuverability.These Substations become ready for service in a few days where additional power is needed.

Mobil Trafo  | TEİAŞ

With the Mobile Substations, we meet the energy requirement quickly when additional power requirements arise in the energy transmission system.

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Mobile Substations

Live maintenance operations with helicopter are carried out in high-voltage lines without interrupting the power by using a method that is applied for the first time in Türkiye in 2019. First of all, energy transmission lines are aerial surveyed by helicopter. At the specified points, each of the insulators, which are polluted over time due to dust, sand, chemical wastes, pesticides, sea salt, and which may cause malfunctions, are cleaned with purified water sprayed from the helicopter in about two minutes.On the other hand, in live maintenance activities with helicopters, energy transmission lines, which are difficult to access from the ground, are provided by aerial access and malfunctions are eliminated or periodic maintenance works are carried out. The works are carried out by our technicians in the basket with isolated ropes hanging from the helicopter, with live maintenance method without de-energizing the line.

Helikopterli Bakım Site

Thanks to live maintenance with helicopter, we carry out maintenance activities in the areas that are difficult to reach, meters above the ground without switching off the energy of the system.

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Live Maintenance with Helicopter

We have been providing energy security of supply of the region by connecting Europe and Asia under the sea at the Dardanelles Strait since we launched first high-voltage submarine cabling project of Türkiye in 2015.The first project put into service, is 3.9 km long Lapseki 1 - Sütlüce 1 submarine cable and it is the first jointless project in the world at 400 kV at this length. After this project, we implemented the second submarine cable project with 4.1 km long Lapseki 2 - Sütlüce 2 line in 1 km south.The connection consists of a 4-circuit double-circuit alternating current (AC) energy transmission system, each with a capacity of 1000 MW between Lapseki substation on the Asian side and Sütlüce substation on the European side.

Deniz Altı Kablolama  | TEİAŞ

We deliver the electricity produced in South Marmara with submarine cable projects under the Dardanelles Strait to all Thrace, particularly to Istanbul.

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Submarine Power Transmission Cable

We work continuously with our live maintenance teams in our energy transmission lines and Substations to ensure uninterrupted and quality electrical energy, minimize interruptions and reduce energy and production losses.We perform these live maintenance applications in two ways: The first one is the distance working method. Here, our operators carry out maintenance work with isolated rods (an insulating apparatus with a hook end used for safety during maneuver) and equipment connected to these rods, taking into account the distances calculated and to be complied with before the operation. The second one is the method of working on potential.In this method, our operators perform the work depending on certain rules and distances, by entering into the same potential with the system potential in three different ways. Vehicles such as positioning chair, ladder and insulated tower, isolated crane are used to provide the operator the same potential with the system potential. With our investments in Research &amp; Development and innovation, we provide saving of both source and time, transmit Türkiye's energy 24/7 all over our country.

Canlı Bakım | TEİAŞ

We continue our live maintenance activities, which we started to implement in 2014, by expanding all over our country.

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Live Maintenance

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Installed Capacity (by the end of February 28, 2026)

123.452,77 MW

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Energy Transmission Line (by the end of January 2026)

76.712 KM

High-Voltage Substations (by the end of January 2026)

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0,4 TWh

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0,1 TWh

Annual Electric Energy Consumption (by the end of January 2026)

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32,2 TWh

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Annual Electric Energy Generation (by the end of January 2026)

32,6 TWh

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The requirement for Research & Development and innovation emerging due to the international competition and globalization process in the world is gaining importance for companies. We are closely following these requirements emerging worldwide nowadays and we are renewing and improving our current activities every day in this direction. Thus, we save time and reduce our costs. While continuously maintaining our technology investments, we 24/7 transmit Türkiye's energy all over our country.

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Integrated Management Policy

Message from our General Manager

Announcements

20 Şubat 2026ADDENDUM - REQUEST FOR PROPOSAL - Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications

20 Ocak 2026REQUEST FOR PROPOSAL-Consultancy Services for Preparation of HVDC and Owner’s Engineer Technical Specifications

18 Kasım 2025Terms of Reference for Consultancy Services for HVDC Transmission Facility

750 Million Dollar Agreement Signed Between Our Corporation and the World Bank

Technology

Research-Development and Innovation

Load Dispatch Control Centers

Mobile Substations

Live Maintenance with Helicopter

Submarine Power Transmission Cable

Live Maintenance

Statistic Data (Values are live, gross and temporary)

Electrical Transmission in Türkiye

Production Share of Renewable Energy

%0

Hydro

Wind

Thermal

Sun

Others