Lower Kaleköy Dam and HEPP
Lower Kaleköy power station, referred to as Aşağı Kaleköy, is set on a deep bedrock on the Murat River in Bingöl province, eastern Türkiye. The main element of the project was the construction of a composite dam, which has a length of 945 meters at the crest level and a structural height of 110 meters. It accommodates a 3-bay spillway regulated by 6 radial gates with a capacity of 9,300 m3/s.
The river flow diversion was achieved with 3 tunnels having dimensions of 497 meters, 520 meters, and 565 meters in length. 132,000 m3 of earth was excavated with the drill-and-blast method to attain a diameter of 11.5 m respectively. They were further each concrete-lined to an internal diameter of 9.5 m.
It was necessary to excavate 5.6 million m3 of soil for the foundation of the dam, including the gravity abutments, and another 5 million m3 of mass rocks were obtained from an on-site quarry to build the rockfill embankment section. For the concrete portion of the composite dam, about 1,650,000 m3 of roller compacted concrete (RCC) was placed during the dam construction. The spillway, incorporated as an integral part of the RCC gravity structure, required a conventional concrete (CVC) volume of 175,000 m3.
The project also encompasses a frontal water intake which forms part of a concrete section. Nearly 2,300,000 m3 of earth was excavated and volume of 125,000 m3 of conventional concrete (CVC) was utilized to build it.
An excess of 1,680,000 m3 of earth was excavated for the switchyard and the powerhouse, as well as 1,500,000 m3 of river dredging was carried out. A volume of 126,000 m3 of reinforced conventional concrete was required to erect the powerhouse and the 4 steel-lined penstock encasements.
The semi underground powerhouse is fitted with 4 generating units, all comprising vertical shaft Francis turbines and related generators. Three (3) large units are equally rated at 155.49 MW, and one small unit delivers 33.53 MW for environmental flow. The total installed capacity is 500.10 MW.
About 12 million m3 of soil was excavated for the prevention and remediation of a land-slide, and to mitigate the risks of other detrimental effects pertaining to the stability of the area.
The project commenced in 2016 and completed in 2020.
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Kalehan Energy