About us

CEO Koray Energy - Board Member

• >30 yrs experience in construction, real-estate and energy sector
• Bogazici University – BA Civil Engineering
• Acquired Koray construction and real-estate company in 2017
• Founded Hun Group* in 2013, with focus on solar and hydro renewables
• Chairman and founding partner at Kayi Construction (1991-2012), world’s #161 international contractor in 2012

Born in 1980 in Istanbul, İlker Hakan Kayhan graduated from Saint-Benoît French High School in 1999 and from Boğaziçi University with a degree in Mechanical Engineering in 2004. He completed his Master’s degree in Engineering and Technology Management at Boğaziçi University in 2007 and earned his MBA from INSEAD (Paris-Singapore) in 2009.

With nearly two decades of experience in business development, investment, finance, and M&A, İlker Kayhan began his career in 2004 at Unilever Turkey’s Business Development Department. He later served as Business Development Manager at GOSB Technopark and as Investment Manager at Kerten Turkey Private Equity Fund.

He joined Koray Group in 2014 as Investment and Business Development Director and, since 2016, has been responsible for the development, construction, and financing of the Group’s renewable energy investments both in Turkey and abroad.

Currently serving as the CEO of Koray Energy, İlker Kayhan has been a Board Member of Koray Group and Hun Renewable Energy since 2021, and has also been a member of the Board of Koray GSYO since 2025.

Board Chairman

• >20 years executive-level experience in risk management, financial affairs and finance
• Gazi University – MSc Banking, Middle East Technical University – BA Economics
• CFO of Koray Group (2020-2022), CEO of Hun Energy (2022), board member of Koray REIT
• Previously risk specialist at Turk Eximbank and Financial Director at Ata Stroy (part of construction company Ata Group)

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He serves as the Project Development Manager and Project Manager at Koray Energy, where he leads the full cycle of renewable energy projects — from initial development to the commissioning of power plants. His primary focus is on the design, construction, and operational deployment of solar power plants (SPPs) across domestic and international markets.

 Since joining Koray Energy in 2013, Alper has played a key role in the company’s first energy investments, contributing to every stage of project execution — from field engineering to project management. Over the years, he has been actively involved in the development and realization of over 300 MW of solar, 40 MW of hydroelectric, 10 MW of biomass, and several hybrid power plant projects.

 Born in Salihli, Alper graduated from Sekine Evren Anatolian High School and holds a degree in Electrical and Electronics Engineering from Dokuz Eylül University. He combines deep technical expertise with a strong commitment to advancing renewable energy solutions. His professional interests span solar, biomass, and hydroelectric power generation, with a focus on sustainable growth and innovation within the clean energy sector.

Serhat Güleryüz holds a bachelor’s degree in Electrical and Electronics Engineering and has been active in the renewable energy sector since 2015. He brings over a decade of hands-on experience across the full project lifecycle, having supervised more than 100 MW of solar PV installations and managed the operations of approximately 150 MW of utility-scale plants across 25 different sites.

 His expertise includes the optimization of O&M operations, the establishment of an inverter repair center along with its technical team, and the design of structured training programs for field personnel. Within EPC frameworks, he has directly managed project development, contract negotiation and administration, procurement processes, logistics coordination, and contractor supervision.

 At Koray Energy, he serves as Project and Business Development Manager for international solar PV and battery energy storage (BESS) projects. He is responsible for leading development activities, evaluating investment opportunities, conducting technical and legal due diligence, and managing acquisition and implementation processes from origination to commissioning.

He holds a Bachelor’s degree in Electrical and Electronics Engineering from Bilkent University and a Master’s degree in Energy Law and Economics from Hacettepe University. Currently, he is furthering his academic journey by pursuing a Master’s in Business Management – Green Energy and Climate Finance at Berlin Professional School, reflecting his commitment to combining technology, law, and finance within the evolving landscape of sustainable energy.

With more than a decade of professional experience in the energy sector, he has developed a strong and diverse background across EPC (Engineering, Procurement, and Construction), consultancy, and investment domains. His career has been shaped by a consistent engagement with multidisciplinary projects, where he has successfully merged technical proficiency with strategic management.

Throughout his professional journey, he has contributed to numerous international energy initiatives, taking on responsibilities that range from technical audits and feasibility studies to international contract management and project financing. His expertise extends to evaluating renewable energy investments, managing complex stakeholder relations, and aligning business strategies with sustainability objectives.

Since joining Koray Energy, he has been leading business development efforts, focusing particularly on European energy investments, cross-border partnerships, and long-term strategic collaborations. His work emphasizes innovation-driven growth, the integration of green finance principles, and the pursuit of opportunities that support the global transition toward clean and resilient energy systems.

An Electrical Engineering graduate from Istanbul Technical University, Tolga has built a well-rounded career combining technical expertise with business insight. He has over three years of experience spanning engineering, consulting, and sales roles across multiple industries.

He began his professional journey as a Project Engineer at an EPC company, gaining hands-on experience in project execution and coordination. He then worked in fire inspection consulting, providing technical and regulatory advisory services, and later took on a regional sales role at one of Turkey’s largest steel producers, where he managed key client relationships and regional market development.

Since 2025, Tolga has been part of Koray Energy as a Business Development Specialist, primarily focusing on project finance, budgeting, and reporting. His responsibilities include leading financing efforts across company investments, conducting negotiations, and monitoring the financial performance of ongoing projects. In addition, he contributes to company setups, mergers, market research, energy sales partnerships, and material procurement processes, supporting the company’s growth through both financial and strategic initiatives.