“Energy is an industry in which Koloğlu Holding has shown rapid growth. Koloğlu Holding operates in all areas of the industry, from energy production to distribution. We continue to invest in hydroelectric power plants, a practice that began with Akköy. We produce energy from both the streams of our country and the sun. With our proliferation of companies, we have a say in the distribution of all energy sources.”





Akdeniz Elektrik Dağıtım A.Ş. (AEDAŞ), which was privatized on May 28, 2013, distributes the electricity received from transmission lines to end users. The working principles of AEDAŞ are determined by the Energy Market Regulatory Authority. The company continues its mission of uninterrupted and high-quality electricity distribution to approximately 2.2 million subscribers in Antalya, Isparta and Burdur with the motto, “We are by your side with our energy.” AEDAŞ upholds its commitment to innovation, service quality, and customer and employee satisfaction through its projects and visionary approach.


Established in 1999, Akköy Enerji undertook the establishment and commissioning within the license periods of 49 years and the management until the completion of these periods of the Akköy I HEPP project, one of the most significant energy projects carried out by a private enterprise in Turkey. Koloğlu Holding A.Ş., Akköy Enerji’s primary partner, has a 97 percent share in the company. With its 40 years of business experience, engineering know-how, and with the market involvement of Kolin Construction and the market confidence it provides, it is the main driving force behind the group’s subsidiaries operating in various industries, including Akköy Enerji. Kolin’s competent and experienced workforce, business experience, know-how, and financial and technical facilities afford it the ability to establish and operate low-cost efficient plants. This is the most significant advantage of Akköy Energy in the electricity market with respect to other companies operating in the same field.

Built on the Harşit River in the Kürtün district, Gümüşhane, the Akköy I Dam and Hydroelectricity Power Plant features a roller-compacted concrete (RCC) body with a height of 54 meters, a 12.5 kilometer-long energy tunnel and a power plant comprising three vertical shaft Francis turbines of 34.5 megawatts (103.5 megawatts in total). Two units of Akköy I HEPP commenced commercial production on September 18, 2008 with the remaining unit following on November 26, 2008.

The Akköy II HEPP Project includes the Aladereçam, Gökçebel and Yaşmaklı dams. To produce energy at the Akköy II HEPP facility, which neighbors Akköy I HEPP, water is channeled to a surge chamber through a energy tunnel. It is then routed to the Akköy II Hydroelectric Power Plant via a penstock, achieving a hydraulic drop of 1,220 meters (the highest drop in Turkey). 


Within the scope of the project, the Aladereçam Dam is situated at an 1,797-meter talweg elevation point above Karaovacık creek in the Gümüşhane province. The dam’s total water-holding capacity has been calculated as 13.934 million cubic meters. The water collected in the Aladereçam Dam reservoir is routed to Aladereçam HEPP via a energy tunnel, a surge chamber and a penstock. The water that passes through the turbines at Aladereçam HEPP pours from the plants outlet into Gökçebel Dam’s reservoir. Gökçebel Dam was built as a rockfill dam with a concrete paved facade at a height of 144 meters and with a crest elevation of 1,630 meters over Gelavara Creek. The dam is connected to the Yaşmaklı Dam reservoir by a transmission tunnel. The dam’s total water-holding capacity is calculated as 94.777 million cubic meters. Constructed as a concrete gravity dam, the Yaşmaklı Dam has a height of 118 meters and a crest elevation of 1,630 meters over Gavraz Creek. The dam body concrete volume is 613,000 cubic meters. The dam’s total water-holding capacity is calculated as 19.707 million cubic meters. The Akköy II HPP Project ranks first in Turkey and is among the top 10 in the world with its hydraulic drop height of 1,220 meters. The plant is equipped with two 135 MVA synchronous generators running on two vertical shaft Pelton turbines, each of which has a power capacity of 116.79 megawatts (233.57 megawatts in total). One unit of Akköy II HEPP commenced commercial production on June 7, 2012 with the remaining unit following on July 5, 2012.

The Yalnızardıç Dam HEPP was constructed over the Gevne River in the Alanya district of the Antalya province. Together with its tailwater regulator, the total installed capacity of the HEPP is 42.32 megawatts/minute and the estimated average annual production is 120 million kilowatts/hour. The Yalnızardıç Dam and Hydroelectric Power Plant has a roller-compacted concrete (RCC) body with a height of 97 meters, a 4,140-meter long energy tunnel and two horizontal shaft Francis turbines with an installed capacity of 16.25 megawatts each (32.50 megawatts in total). The facility is also equipped with a power plant with an installed capacity of 0.54 megawatts. It is positioned at the spillway outlet to facilitate the release of tailwater from the dam. The dam’s crest elevation is 1,361 meters and the talweg elevation is 1,269 meters. The concrete volume of the dam’s body is calculated as 490,000 cubic meters and the total water-holding capacity is calculated as 109.5 million cubic meters. At the Yalnızardıç Dam and HEPP, commercial production commenced in the first unit in March 2015, in the second unit in April 2015 and in the third unit in May 2015. The tailwater regulator of the Yalnızardıç Dam has a crest elevation of 1,168.1 meters and a talweg elevation of 1,161 meters. The transmission length is 3,847 meters, of which 2,627 meters consists of tunnels. The plant building accommodates a total of four horizontal shaft Francis turbines. Of these, three have an installed capacity of 1.45 megawatts while another has 4.93 megawatts. The total installed capacity is 9.28 megawatts. The plant commenced commercial production in September 2013.


Located downstream from the Akköy I Dam, the Akköy I Cansuyu HEPP began commercial production on January 4, 2018. The plant’s installed power is 0.52 megawatts and has an estimated average annual production of 4,261,000 kilowatts/hour.




Supplying power to Istanbul and its surroundings since 1970, Boğaziçi Elektrik Dağıtım A.Ş. (BEDAŞ) began operating as a private enterprise in 2013 as part of the privatization process. The company operates on the European side of Istanbul, a major financial, commercial and industrial center where 27 billion kilowatts/hour of electricity is distributed annually. BEDAS continues to invest in network improvement and facility establishment to meet the ever-increasing power demand while retaining its high-quality efficiency standards and track record of minimal disruptions. With nearly 5.2 million subscribers, the European side of Istanbul has the highest electricity consumption rate of all Turkish regions.



As of May 28, 2013, CK Enerji Akdeniz Elektrik began its operations as a retail electricity sales company in the Mediterranean Region with the motto “Always with you.” CK Enerji Akdeniz Elektrik serves more than 1.8 million customers in the Mediterranean Region encompassing the provinces of Antalya, Burdur and Isparta. As an authorized supplier, the company sells retail electricity at national price rates to all eligible consumers in Turkey through bilateral agreements, and to non-eligible consumers in the provinces (Antalya, Burdur, Isparta) where the company is authorized by the license granted by the Energy Market Regulatory Authority.



As an “authorized supplier,” CK Enerji Boğaziçi Elektrik serves approximately 4.5 million subscribers on the European side of Istanbul, which corresponds to 10 percent of the total Turkish market, based on retail sales tariffs approved by the Energy Market Regulatory Authority (EMRA). The company can also sell electricity through reduced tariffs and promotion campaigns by making bilateral agreements with eligible consumers and without regional restrictions. Additionally, it converts previous electricity bill payment points to Customer Transaction Centers (CTC) as part of its corporate transformation. As of March 2015, when this transformation began, CK Enerji Boğaziçi Elektrik opened one transaction center every three days, becoming one of the “fastest expanding retails companies.” The company currently has the most widespread energy retail channel in Turkey with almost 300 CTCs, and continues to evolve and transform its operations to offer superior a service in retail electricity sales and subsequent operations.



Operating as part of Kolin and Cengiz Holdings, CK Enerji Çamlıbel Elektrik provides retail electricity sales services to 900,000 customers with its electricity sales license. CK Enerji Çamlıbel Elektrik strives to supply power to end users in the most efficient way and at the most affordable price. The company sells energy to last-resort and eligible consumers in its region of operation and to all eligible consumers throughout Turkey. CK Enerji Çamlıbel Elektrik strives to provide a high-quality service to its customers.



CK Enerji Yatırım Ortaklığı, who serves electricity consumers all around Turkey, conducts the trading of electricity through bilateral agreements, and retail sales of electricity to eligible consumers and consumers covered by last resort supply by means of the “Electricity Supplier License” it was granted within the framework of the Electricity Market Licensing Regulation in 2011.


CK Güneş began its energy production in 2017 and has a total installed capacity of 43.5 megawatts peak GES in five cities across Turkey. The company’s plants utilize state-of-the-art technology. In these plants, the company opted for thin-film solar modules, which are ideal for climate conditions, and central inverters to maintain maximum plant stability. The plants that produced 70 million kilowatts/hour of electricity in 2019 are monitored and tracked 24/7 through fully automated systems.




Çamlıbel Elektrik Dağıtım A.Ş. (ÇEDAŞ) commenced operations following its privatization on August 31, 2010. ÇEDAŞ, whose working principles are determined by the Energy Market Regulatory Authority, distributes electricity received from transmission lines to end users. With a high-quality service approach, ÇEDAŞ distributes 2.5 billion kilowatts/hour of electricity to more than 1 million subscribers on an area of 51,869 square kilometers in the Sivas, Tokat and Yozgat provinces.



Established in 1992 by BOTAŞ to distribute natural gas, ESGAZ was privatized in 2004 and became a part of Kolin İnşaat ve Turizm A.Ş. Following its privatization, the company’s corporate structure was established by determining the standards in management and services, and a customer-oriented management system was initiated, which lead to a rapid expansion of the utilization of natural gas. ESGAZ, one of Turkey’s first natural gas distribution companies, reached approximately 485.000 natural gas subscribers in Eskişehir in a short period of 17 years. With a customer-oriented service approach, ESGAZ offers natural gas to Eskişehir, an economical, efficient, convenient, environmentally friendly and clean fuel, and conducts its operations in compliance with the regulations of the Energy Market Regulatory Authority (EMRA).
As of the end of 2020, the company provides uninterrupted and secure natural gas distribution services to 485.000 subscribers of Detached Dwelling Units in Eskişehir through a network of 2.834 kilometers and with an annual gas volume of 800 million m3.
ESGAZ continues to invest in its computational, technological and natural gas infrastructure to provide a faster, modern and convenient service to its natural gas subscribers. With its experienced and competent workforce, the company provides secure, economic and uninterrupted natural gas supply to increase the comfort of its subscribers at their homes and workplaces. 



The utilization of natural gas, which is an alternative energy source to meet the growing energy demand borne from population growth and industrialization, began in the 1970s as a solution to escalating urban air pollution. The utilization rate and application areas of natural gas gradually increased thanks to its inherent advantages and growth in energy demand. Natural gas was first imported to Turkey in 1987. ETKI Liman completed construction of the Floating Liquefied Natural Gas Storage and Regasification Terminal, which meets the highest security standards, in the Kızılburun area of Çakmalı village in the Aliağa district of the Izmir province. The terminal was commissioned in December 2016 for the regasification of liquefied natural gas imported by gas carrier ships by means of vessels referred to as Floating Storage Regasification Units (FSRU). The terminal plays a critical role in meeting seasonal fluctuations in natural gas consumption. Furthermore, it aims to maintain the system pressure profile and ensure the security of the natural gas supply by delivering the maximum amount of gas from the terminal to the system, particularly during peak consumption periods. The terminal facilitates the distribution of gas from alternative sources when needed without depending on pipelines, creating an additional supply to the national natural gas system to the extent of its storage and regasification capacities. The ETKI Floating LNG Terminal enables natural gas to be imported from varying sources of supply. It also grants daily and hourly supply flexibility to the system on peak consumption days, and enables the national gas transmission network to be fed uninterruptedly, which contributes to the security of supply in household and industrial consumption as well as in the electricity generation industry.


Hidro-Gen Enerji Ithalat Ihracat Dağıtım ve Ticaret A.Ş. (Hidro-Gen) was founded in 2007 as a subsidiary of the Koloğlu Holding Group. The “Soma Kolin Thermal Power Plant”, which features an installed capacity of 2 x 255 electrical megawatts, was commissioned by Hidro-Gen and started commercial operations in the Soma district of Manisa province in 2019. Within the scope of the “National Energy” policy led by the Ministry of Energy and Natural Resources, the Soma Kolin Thermal Power Plant is the leading project which efficiently generates power by using local resources from the Soma region, which has the 2nd largest lignite reserve in Turkey.

This project will enable our country’s economy to acquire electricity from 4.7 million tons of lignite annually, thereby reducing dependency and imports of natural gas up to almost $190 million annually. The Soma Kolin Thermal Power Plant will be operated by the Koloğlu Holding Group for 30 years from the date of commissioning. Within the operating period of 30 years, 120 million tons of coal will be used for generating power.  Deniş II, Kozluören, Türkpiyale open-pit mines and Soma Kolin Thermal Power Plant mine sites that will use Evciler closed-pit mine sites have been established for a total investment of $ 1.1 billion with a switchyard and energy transmission lines, ash storage area, pipe conveyor lines between the mine and the ash storage areas and the power plant, 2 ponds together with a water supply system consisting of 1 regulator and transmission lines. The construction of the Soma Kolin Thermal Power Plant is an example of international engineering work. The project is the product of cooperation of Turkish, Chinese, Finnish and German Engineers. The EPSC Contractor Chinese "Harbin Electric International" managed all the processes from the commencement of the project to the commissioning of the power plant and the initiation of commercial production.

By factoring the local lignite quality and properties, the plant uses modern Circulating Fluidized Bed Technology to ensure the low-calorie fuel with high ash, sulfur and humidity content, to combust with the highest efficiency (46,15%, gross), and the plant is equipped with boilers, desulfurization and particulate collection systems of the world-renowned Sumitomo Foster Wheeler that is the leader in the market. The plant’s Circulating Fluidized Bed boiler ranks among the 10 largest of its kind in the world. 2 x SST5-5000 series high efficiency steam turbine and generators sets of 255 MWe capacity, engineered and manufactured by “Siemens AG” in Germany, are used in the Some Kolin Thermal Power Plant.

The “Circulating Fluidized Bed Technology” utilized as the power plant’s coal combustion method is recognized as environmentally friendly, clean, ideal and the most advanced coal-burning technology for Turkish coals. In addition to creating the highest combustion efficiency, this technology provides low sulfur dioxide and nitrogen oxide emissions below environmentally safe limits. With this technology, sulfur dioxide is removed by adding limestone to the boiler, and the nitrogen oxide removal is enabled by high combustion yield. For the plant’s flue gas desulfurization system, the company selected a state-of-the-art technology, and the emission levels achieved by the plant’s flue gas treatment system satisfy the emission limits in effect in Turkey and the European norms (Industrial Emissions Directive 2010/75/EU). Moreover, this system will help meet the even lower emission targets to be stipulated by the European Union in the upcoming years without requiring any additional investments. The Soma Kolin Thermal Power Plant has fulfilled all its obligations under the environmental regulation in force and was granted the Environmental Permit and License Certificate by the Ministry of Environment and Urbanization.


Izmir Doğalgaz acquired the Distribution License on July 7, 2005 to carry out the distribution and transmission of natural gas through the local gas pipeline network in its region of distribution, which consists of the cities of Izmir and Tire. The Bergama, Ödemiş and Kınık districts were added to the regions of the Distribution License in accordance with the Board’s decision of Energy Market Regulatory Authority (EMRA) on June 17, 2015, and the Kiraz district was added to the Distribution License on July 2, 2020 with the Board’s Decision.
The goal of Izmir Doğalgaz is to provide natural gas, an economical, environmentally friendly and convenient product, to the Izmir province and its districts by using the latest technology and a secure infrastructure, as well as to ensure customer satisfaction and to ensure and expand the utilization of natural gas through a high-quality and fast service approach.

Since December 2005, when the infrastructure works began, a total of 730.550 meters of steel lines, 4.475.000 meters of polyethylene main lines, and 2.324.000 meters of service lines were installed and 229.820 services boxes were produced. As of March 2021, the number of subscribers (connection agreements) reached 930.000. Moreover, 27 RMS-A stations, 206 local regulators, and 408 customer stations were built and commissioned.

Residential use of natural gas in Izmir was launched at a ceremony on July 13, 2006, and ss of today, natural gas is being used by the citizens of Izmir in 26 districts, namely in Karşıyaka, Konak, Bornova, Bayraklı, Buca, Karabağlar, Gaziemir, Çiğli, Narlıdere, Balçova, Aliağa, Torbalı, Kemalpaşa, Menemen, Tire, Menderes, Ödemiş, Kınık, Bayındır, Selçuk, Bergama, Güzelbahçe, Foça, Seferihisar, Urla and Kiraz.

Besides residential areas, Izmir Doğalgaz currently has 306 large- and small-sized industrial customers in 9 organized industrial zones thanks to the investments made in the industry sector, and as of the end of 2020, the Company has supplied almost 3.906 billion cubic meters of natural gas in its region of distribution.

Izmir Doğalgaz contributes significantly to the economy of Izmir and the country by providing employment to thousands of people both directly and through its co-operation with many infrastructure companies, almost 200 domestic installation firms, and other manufacturing, marketing and suppliers firms.

Furthermore, the company has been awarded ISO 9001 Quality Management System, ISO 14001 Environmental Management System, ISO 10002 Customer Satisfaction and Complaints Handling Management System, ISO 27001 Information Security Management System, ISO 22301 Business Continuity Management System, ISO 45001 Occupational Health and Safety System and ISO 50001 Energy Management System certificates.



KOLEN is the energy company in charge of Koloğlu Holding’s wholesale electricity trade, development of retail subscriber base and all potential value-added services, which provides services to its subscribers and prospective subscribers across Turkey.

Having adopted it a mission to create value for all its shareholders from its subscribers and business partners to its investors and employees, KOLEN has a vision to be an ever-evolving, favoured, reliable organisation thought as a first choice and a reputable brand that is both environmentally and socially conscious with a product, service and solution oriented approach in business, leading to satisfaction with the benefits it provides in the energy industry.
 KOLEN’s staff has made satisfying subscribers their primary goal and corporate approach. They are aware that this contentment lies in achieving the highest level of quality in any contact with Kolen, and, they plan their behaviours and business processes and take action accordingly. In addition, KOLEN recognizes the importance of internal customer satisfaction and team spirit, and nurtures them accordingly. The KOLEN staff are a united and motivated team, a family.
Growing every year in terms of consumption volume and turnover and increasing the number of its subscribers, KOLEN's turnover grew by 40% again in 2020. It provided more than 2,200,000,000 kWh of electricity to its subscribers. It has gained a significant amount of experience and specialized in areas such as energy supply, invoicing, collection, after-sales services, subscriber satisfaction, and customization, especially for a wide range of large-scale organizations throughout the country.
KOLEN has launched a campaign with #bakkalınasahipçık (support your local grocery store) approach to serve 130,000 grocery stores selling its international ice cream brand with a penetration rate of more than 70% currently.
For some time, KOLEN has been educating little ladies and gentlemen in kindergartens on the importance of saving energy, an activity referred to as “KOLEN ENERGY HEROES”. Although the education normally provided in person in schools were suspended in 2020 due to the pandemic,, KOLEN started to shoot and produce cartoons with the same title and content. These cartoons can be accessed from social media, other electronic media, and e-platforms of KOLEN.





TKD Kuzey Enerji Üretim A.Ş., a 50 percent partnership of which is owned by Kolin Construction, incorporates the Torul Dam and HEPP, Kurtün Dam and HEPP and the Doğankent HEPP located on the Harşit River in the Gümüşhane province. The Torul, Kürtün and Doğankent Hydro Electric Power Plants previously belonged to the Elektrik Üretim A.Ş. (EÜAŞ). Following a privatization tender, the Privatization Administration granted the operating rights of the plants and their estates for 49 years to the TKD Kuzey Enerji Üretim A.Ş. on April 29, 2016. TKD Kuzey Enerji Üretim A.Ş.’s Torul Dam and HEPP commenced operation in January 2009 to generate electricity over Harşit Creek in the Torul district of the Gümüşhane province. The plant consists of two units of 51.6 megawatts and has an annual electricity generation capacity of 322 gigawatt hours. Torul Dam and HEPP is located upstream of the Kürtün HEPP, another plant of the TKD Kuzey Enerji Üretim A.Ş. Kürtün Dam and HEPP commenced operations in 2003 to produce electricity over Harşit Creek in the Kürtün district of the Gümüşhane province. With a total installed capacity of 85 megawatts thanks to two units of 42.5 megawatts, the plant has an annual electricity generation capacity of 198 gigawatt hours. Kürtün Dam and HEPP is located upstream of the Akköy I HEPP, another plant owned by the Kolin Group, and downstream of the Torul HEPP. Doğankent HEPP is established in the Doğankent district of the Gümüşhane province to utilize the flows of Harşit Creek and its offshoot, Kavraz Creek. The plant has an annual electricity generation capacity of 314 gigawatt hours with an installed capacity of 74.5 megawatts (four units of 8.2 megawatts and one unit of 41.7 megawatts). Doğankent HPP is located upstream of the Aslancık HEPP and downstream of Akköy I and II HEPPs, which also belong to the Koloğlu Holding. The plants, which are part of the TKD Kuzey Enerji A.Ş., and the Akköy I and Akköy II HEPPs, which belong to the Koloğlu Holding, are operated over the main stream and the side branches of Harşit Creek, as per the integrated river basin optimization approach.