TEIAS

What TEIAS does

TEİAŞ (Türkiye Elektrik İletim A.Ş.) is the state-owned monopoly transmission system operator of Turkey, holding the sole transmission license issued by the Energy Market Regulatory Authority (EPDK) since 13 March 2003. The company operates Turkey's national electricity transmission grid, comprising 77,188 km of transmission lines at 400 kV, 154 kV, and lower voltages, along with 823 transformer substations and 15 international interconnection points. Its system has operated synchronously with the European ENTSO-E network since September 2010, enabling cross-border electricity trade.

The company serves electricity generation companies, distribution companies, free consumers, and organized industrial zones (OSBs), all of which are legally required to enter into connection and system usage agreements with TEİAŞ. Core operational capabilities include a National Load Dispatch Center and 9 Regional Load Dispatch Centers running 24/7 to balance generation and consumption in real time, perform N-1 contingency analyses, and operate balancing and ancillary services markets. Technical assets include live-line maintenance capabilities (operational since 2014), helicopter-based live maintenance (since 2019), 12 mobile transformer substations, and the world's first 400 kV-level splice-free submarine cable crossing the Çanakkale Strait (3.9 km, 2015). The company also deploys the domestically developed Dynamic Acoustic System (DAS) across all 2,000+ high-voltage lines for theft prevention, and a 5-year InSAR satellite monitoring project with Istanbul Technical University covering 200,000+ infrastructure points for landslide risk detection.

TEİAŞ's revenue is derived exclusively from regulated transmission tariffs charged to grid users, calculated monthly based on energy and power values per the SKYS (System Usage Management) system, with an EPDK-set annual revenue cap that must be met exactly. The company operates under a state-economic-enterprise structure (KHK 233) overseen by Turkey's Ministry of Energy and Natural Resources, governed by a 6-member Board of Directors, with Mustafa PUSTU serving as Acting Chairman and General Manager as of April 2026. The organization spans 22 regional directorates and 10 load dispatch operations directorates across Turkey, with a headquarters in Ankara. In October 2025, TEİAŞ secured a $750 million World Bank loan for transmission system transformation, and in 2026 it signed an MOU with Pakistan's ISMO to extend technical cooperation abroad.

Name

TEIAS

Legal name

Türkiye Elektrik İletim A.Ş.

Website

https://teias.gov.tr

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

TEİAŞ is Turkey's state-owned monopoly electricity transmission system operator, managing 77,188 km of grid and 823 substations to transmit power from generation companies to distribution companies, free consumers, and organized industrial zones under EPDK regulation.

Ownership category

akta.pro rank

Product category

Electricity Transmission Services

NAICS

Electric Power Transmission, Control, and Distribution (22112), Electric Bulk Power Transmission and Control (221121), Electric Power Generation, Transmission and Distribution (2211)

SIC

Electric Services (4911), Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

National & Regional TSOs (ISO/RTO/Grid Operators) (EUADAAAA)

akta.pro secondary industries

HV Transmission Asset Owners (Transmission Companies/Transcos) (EUADAAAC), System Operations & Control Centers (EMS/SCADA for Transmission) (EUADAAAG), Cross-Border Interconnectors & Regional Transmission Coordination (EUADAAAB), Testing, Commissioning, Maintenance & Retrofit/Modernization (Substations/Switchgear) (EUADACAL)

Keywords

• Electricity transmission services
• Grid system operations
• Power transmission infrastructure
• Load dispatch services
• National grid operator

Headquarters

HQ city

Çankaya

Offices37 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Technology or R&D, Supply Chain, Others

Revenue model

1. Transmission Tariffs (İletim Bedelleri): TEİAŞ's sole revenue source is transmission fees charged to users of the transmission system. These fees are calculated monthly using the System Usage Management Software (SKYS) based on: (1) the energy value that the user's facility injects into or draws from the transmission system, and (2) the power value specified in the system usage agreement. Fees are determined based on TEİAŞ's annual revenue cap set by EPDK, and must not exceed or fall below this cap. Tariffs have a non-geographic regional structure. The revenue cap is submitted to EPDK by end of each December, approved, and published in the official gazette.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

TEİAŞ operates Turkey's national electricity transmission grid as a state-mandated monopoly transmission system operator, transmitting electricity from power generation facilities to distribution networks across Turkey. The company operates 77,188 km of transmission lines, 823 transformer substations, 15 international interconnections, and a network of 1 national and 9 regional load dispatch centers that run 24/7 to maintain real-time generation-consumption balance, grid stability, frequency control, and balancing/ancillary services markets. Its sole revenue source is EPDK-approved transmission tariffs charged to generation companies, distribution companies, free consumers, and organized industrial zones.

Product overview

TEIAS (Türkiye Elektrik İletim A.Ş. / Turkish Electricity Transmission Corporation) operates as Turkey's national electricity transmission system operator (TSO), managing a nationwide grid infrastructure that transmits electricity from generation facilities to distribution networks. The core operational offering consists of the Yük Tevzi Kontrol Merkezleri (Load Dispatch Control Centers) — a national + 9 regional control centers running 24/7 to balance generation and consumption, manage grid security, and operate balancing and ancillary services markets. Supporting this core grid operation are specialized technical services: Mobil Transformatör Merkezi (12 portable mobile transformer substations deployed for emergencies), Canlı Bakım (live-line maintenance without power interruption), Helikopterli Bakım (helicopter-based aerial maintenance), and Denizaltı Enerji İletim Kablosu (submarine cables including the 400 kV Çanakkale Strait crossing). On the technology side, TEIAS operates the OSOS (Automatic Meter Reading System) for automated energy measurement, the SKYS (System Usage Management Program) for managing user agreements, the domestically-developed DAS (Dynamic Acoustic System) for transmission line theft prevention, and an InSAR-based landslide monitoring system developed with ITU. TEIAS also offers an internal mobile application for employee access to corporate systems and personal data. TEIAS operates under an İletim Lisansı (Transmission License) from EPDK (Energy Market Regulatory Authority) and is connected synchronously to the European grid via ENTSO-E since 2010.

Differentiator

Problem solved

Functional benefit

Products and services

• Yük Tevzi Kontrol Merkezleri (Load Dispatch Control Centers) A network of 10 control centers (1 National Milli Yük Tevzi Merkezi and 9 Regional Bölgesel Yük Tevzi Merkezleri) operating Turkey's 400 kV and 154 kV electricity transmission system 24/7, managing real-time generation-consumption balance, grid security, N-1 contingency analyses, balancing power markets, ancillary services markets, frequency control, and international interconnection lines.
• Mobil Transformatör Merkezi (Mobile Transformer Substations) 12 portable 154/33.6 kV, 50 MVA mobile transformer substations mounted on 150-ton, 27-metre special trailers that can be deployed within days to address additional power needs, support maintenance/breakdown situations, or respond to natural disasters.
• Canlı Bakım (Live-Line Maintenance) Live-line maintenance services on transmission lines and substations without interrupting power supply, using distance-working methods (insulated sticks and equipment) and potential-working methods (positioning chairs, ladders, insulated cranes, insulated crane baskets) to ensure uninterrupted electricity supply.
• Helikopterli Bakım (Helicopter-Based Live Maintenance) Helicopter-based live maintenance for hard-to-reach high-voltage transmission lines, including aerial observation, insulator cleaning with purified water, and live repair operations via suspended baskets, without shutting off power.
• Denizaltı Enerji İletim Kablosu (Submarine Power Cable Projects) Submarine cable projects connecting Lapseki (Asia side) to Sütlüce (Europe side) across the Çanakkale Strait, enabling cross-continental power transmission. The first project at 3.9 km is the world's first 400 kV-level cable of that length without splice; each circuit carries 1000 MW capacity.
• SKYS - Sistem Kullanım Yönetim Programı (System Usage Management Program) Web-based software for managing transmission system usage agreements, enabling authorized transmission system users (generation companies, distribution companies, free consumers, OSBs) to access agreements, view agreement details, and monitor guarantee status. Transmission fees are calculated monthly based on energy values and contract power values.
• OSOS - Otomatik Sayaç Okuma Sistemi (Automatic Meter Reading System) Automated meter reading system collecting energy measurement data from smart meters (scalar devices), encrypting and compressing data, and transmitting via GSM or Ethernet to central servers. Supports transmission fee calculations, penalty applications, and EPİAŞ settlement processes for transmission system users.

Quantifiable outcome

• 77,188 km of energy transmission lines operated nationwide (June 2026)
• +4 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability4 records

Feature11 records

Partnerships

Nine partnerships are on record, tiered major, core and minor.

• Manitoba Hydro International Ltd. (MHI)majorImplementation/ SI/ Consulting Partner · 21 July 2026MHI was selected as the successful bidder for the HVDC and Owner's Engineer Technical Specifications consultancy contract (DB.HVDC.P1, reference). The contract was signed for 672,779 EUR (excluding VAT) for a duration of 1 year. MHI will prepare two tender specifications: a Generic HVDC Technical Specification for a ±525 kV, 2000 MW VSC-based bipole HVDC transmission link with metallic return, and an Owner's Engineer Tender Specification.
• ENTSO-E (European Network of Transmission System Operators for Electricity)coreStrategic or Co-development Partner · 14 July 2026ENTSO-E is the European association of transmission system operators. TEİAŞ has been operating Turkey's electricity system in synchronous parallel with ENTSO-E since September 18, 2010. TEİAŞ holds observer membership and participates in ENTSO-E General Assembly, working groups, and regional coordination activities. Regular bilateral meetings are held to discuss cooperation and Turkey's observer membership progression.
• ISMO (Pakistan's Independent System and Market Operator)majorStrategic or Co-development Partner · 25 June 2026A Memorandum of Understanding was signed between TEİAŞ and Pakistan's ISMO in EPİAŞ on June 25, 2026, under the participation of the Turkish Minister of Energy and Natural Resources and Pakistan's Energy and Privatization Ministers. TEİAŞ committed to providing necessary support for the development of Pakistan's electricity transmission network and initiating technical team meetings in the shortest possible time.
• OPC/STA (Outage Planning Coordination / Short-Term Adequacy) TSO NetworkmajorStrategic or Co-development Partner · 16 June 2026TEİAŞ hosted the OPC/STA Summer Summit 2026 in Istanbul (June 16-18, 2026), bringing together Transmission System Operators (TSOs), Regional Coordination Centers (RCCs), and ENTSO-E representatives to discuss outage planning coordination and short-term supply adequacy assessments, strengthening cooperation on operational planning for the European interconnected grid.
• Istanbul Technical University (İTÜ)coreTechnology or Integration · 14 January 2026Contract signed with İTÜ for a 5-year InSAR (Interferometric Synthetic Aperture Radar) monitoring project covering at least 200,000 points (all TEİAŞ transmission towers and transformer substations). The technology uses satellite radar signals to detect centimeter-level ground displacement, enabling landslide risk analysis and early warning for critical infrastructure areas.
• Bilkent UniversitycoreTechnology or Integration · 13 January 2026Collaboration to develop and deploy the Dynamic Acoustic System (DAS), a domestically and nationally developed high-security technology to prevent theft from electricity transmission lines. Turkish engineers developed both hardware and software. The system has been deployed across all 2,000+ active high-voltage lines in Turkey (total 76,701 km).
• CIGRE Türkiye (CIGRE Türkiye Ulusal Komitesi)minorStrategic or Co-development Partner · 5 November 2025TEİAŞ is a member of CIGRE Türkiye, which organized the 4th Power Systems Conference (GSK) on November 5-6, 2025 in Ankara. The conference featured sessions on energy supply security, grid flexibility, carbon-neutral transformation, and HVDC systems, with TEİAŞ personnel presenting multiple technical papers across 7 sessions.
• MEDREG (Mediterranean Association of Energy Regulators)majorStrategic or Co-development Partner · 27 May 2025TEİAŞ co-hosted (with EPDK) a workshop in Antalya (May 27, 2025) organized jointly by MEDREG and Med-TSO on 'Toward an Interconnected Mediterranean Electricity Market: Overcoming Technical and Policy Barriers.' The workshop addressed cross-border interconnections, renewable energy integration, and harmonized regulatory frameworks, with participation from the European Commission, Arab League, and sector institutions.
• Med-TSO (Mediterranean Transmission System Operators Association)majorStrategic or Co-development Partner · 27 May 2025TEİAŞ participated as co-host in the MEDREG-Med-TSO joint workshop in Antalya (May 27, 2025) addressing Mediterranean energy cooperation, cross-border interconnections, renewable energy integration, and grid stability. Both associations are co-financed by the European Union.

Scale indicators13 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• National Grid (UK): National Grid operates the high-voltage transmission network in England and Wales, providing near-direct comparability to TEİAŞ as a national transmission system operator with regulatory revenue caps and similar balancing/auction market structures.

Direct peers

• RTE - Réseau de Transport d'Électricité (France): RTE is the French national TSO operating the extra-high-voltage grid, balancing generation/demand, and coordinating with ENTSO-E. It is the closest analog to TEİAŞ in scale, regulatory model, and integrated national/regional dispatch function.
• Terna (Italy): Terna is Italy's national TSO, operating the high-voltage transmission grid, dispatching, and managing cross-border interconnections within ENTSO-E. Comparable to TEİAŞ in regulatory structure, network length, and island/peninsula interconnection complexities.
• Red Eléctrica de España (Spain): REE is the Spanish TSO and system operator, managing the peninsula's high-voltage grid and interconnections with France and Morocco. Directly comparable to TEİAŞ as a regulated national grid monopoly with ENTSO-E membership.
• TenneT (Netherlands/Germany): TenneT is a major European TSO operating high-voltage grids across the Netherlands and Germany, with significant offshore wind integration. Comparable to TEİAŞ in ENTSO-E coordination, cross-border interconnections, and renewable integration challenges.
• Amprion (Germany): Amprion is one of four German TSOs operating the extra-high-voltage grid in western Germany, with major cross-border interconnections. Comparable to TEİAŞ in operating scale, regulatory oversight, and ENTSO-E coordination.
• 50Hertz (Germany): 50Hertz operates the extra-high-voltage grid in northern/eastern Germany with strong offshore wind integration. Comparable to TEİAŞ in dispatch complexity, ENTSO-E integration, and renewable-driven grid expansion.
• Swissgrid (Switzerland): Swissgrid is the Swiss national TSO operating the extra-high-voltage grid with ENTSO-E. Comparable to TEİAŞ in regulated national monopoly structure, cross-border interconnections, and balancing market operations.

Regional players

• ČEPS (Czech Republic): ČEPS is the Czech TSO operating the extra-high-voltage transmission system and acting as a regional coordinator in Central Europe. Comparable to TEİAŞ in ENTSO-E integration, cross-border interconnections, and balancing market operations.

Others

• ENTSO-E (European Network of TSOs): ENTSO-E is the association of European TSOs; TEİAŞ has been a synchronous observer member since 2010. Not a peer but an institutional counterpart that coordinates TEİAŞ's grid operations and interconnections with European peers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/kurumsalTEIAS
• Facebookfacebook.com/kurumsalTEIAS
• LinkedInlinkedin.com/company/teias

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about TEIAS