The 670 MW Deriner hydropower scheme is located on the Çoruh River in North Eastern Turkey. The construction began in 1998 and was completed in 2014. The Deriner dam is a 249 m high double curvature concrete arch dam with a 750 m long crest, the highest in Turkey. The underground powerhouse is equipped with 4 units with Francis turbines. The electricity produced is injected in the network through a 380 kV switchyard.
Technical description of the deriner dam and hydropower scheme
The Deriner dam is a 249 m high double curvature concrete arch dam with a 750 m long crest. The volume of concrete placement amounted to 3,400,000 m3. The 917 m long diversion tunnel is horseshoe-shaped and has a 11.4 m diameter. To secure the foundation, over 2,000 re-stressable post-tensioned rock anchors were installed. The eight orifice spillways consist of 2.8 m x 5.6 m openings through the dam and are equipped with flat gates with a max discharge of 7’000 m3/s. The lateral overflow spillways consist of two tunnels, each on opposing banks, with a max. discharge capacity of 2’250 m3/s. The right tunnel is 459 m long and the left one is 472 m long. Each tunnel is controlled by a 6.5 m high, 24 m long flap gate. The power intake is located next to the dam on the right bank. It consists of an inclined concrete structure on top of a 133 m high vertical shaft. At the base of the shaft a horizontal steel lined tunnel leads to a four branches manifold (L = 195 m) and to four lined penstocks (diameter = 6.8 m, L = 27 m each). The powerhouse complex comprises the main cavern (L = 120 m, B = 20 m, H = 43 m) and the valve chamber (L = 95 m, B = 9 m, H = 19 m). The total excavated volume is over 500'000 m3.
The underground powerhouse is equipped with 4 units with Francis turbines, having a total installed capacity of 670 MW. The turbined water is discharged to the Çoruh River through four tailrace tunnels (diameter = 12 m, L = 75 m). The produced energy is transferred by bus bar ducts through two vertical shafts from the generators to the transformers located in a separate cavern and from there to the 380 kV switchyard. The Scheme was commissioned in February 2013.
- Hydropower & dams