Oşkan Dam and HEPP

The 25 MW Upper Ceyhan Hydropower project, also referred to as Oşkan Dam, is situated on the lower reaches of the Ceyhan River within the borders of Osmaniye province in the southern part of Türkiye. It is the first phase of a power station executed in the cascade development of two (2) infrastructure projects by a joint venture (JV), led by Özaltın Construction Company with its partner, Nurol Construction Company.

The project scope encompassed the construction of a low-head dam composed of a zoned earth embankment with a central impermeable clay core on the left bank of the river, and a water intake integrated with a powerhouse on the right bank of the river. An overflow concrete spillway with a capacity of 1,700 m³/s and regulated by four (4) radial gates located in between, combines the earth embankment to the intake structure. All together these structures form a composite crest length of 350 meters with a height of 25 meters.

Nearly 2,000,000 m³ of soil were excavated for the foundation of the dam including the spillway, the power intake, as well as the powerhouse. it was also required to place 470,000 m³ of rock as the main filling material to form the embankment section of the dam. About 115,000 m³ of reinforced concrete were used in the construction of the spillway. A total of 135,000 m³ of reinforced concrete were required to build the powerhouse, and power intake.

The power plant is located at the base of the dam. It is equipped with 3 pit-type horizontal axis Kaplan turbines, and their associated generators with an installed capacity of 25 MW and is currently generating an average output of 109 million kWh of energy. Construction of the project began in 2007. All three (3) units were fully commissioned, and officially inaugurated 2010.