Beyhan I is a 600MW hydroelectric power plant under construction on the river Murat in the Elazığ province in eastern Turkey. It is the first among four hydroelectric power plants to be developed on the Murat River by Kalehan Enerji Üretim ve Ticaret (Kalehan Energy Generation), a joint venture comprised of Özaltın Construction and Cengiz Construction. Kalehan Enerji.
The other three plants are Beyhan II, and the upper and lower Kalekoy hydropower plants. The combined installed capacity of the four plants will be 1,855MW.
The Beyhan I hydropower plant is expected to become operational in mid-2015. With an electricity generation capacity of 1,253.73GWh per annum, it is expected to serve up to 400,000 Turkish households upon commissioning.
Beyhan I is the first Turkish hydroelectric project to be developed by private partners. It will be a run-of-river plant comprised of three diversion tunnels, a 97m-tall roller-compacted concrete (RCC) dam with 365m crest length and 10m crest width, an underground power house accommodating four generating units, and a 380kV switchyard for transferring the generated power to the grid.
The diversion tunnels with 9.5m diameter each are 540m, 570m and 616m in length. The RCC dam creates a reservoir volume of 369.06million cubic metres.
The penstocks of the plant will be 7.8m-long and have a discharge capacity of 856.2m3/s. The dam’s spillway will have six openings with a 11.5m-wide and 15.2m-high radial gate each. The design discharge capacity of the spillway will be 10.52m3/s.
The Beyhan I will consist of three 186MW Francis turbines to be supplied by Andritz and one 32MW turbine to be supplied by Alstom. The turbines will be operated with a gross head of 77m.
Each Francis turbine runner will have a diameter of 6m and weigh 80t. The three generators to be used will have an output of 235MVA. The generators will have an outer diameter of 13.5m and a height of 7.9m.
Construction of the Beyhan I dam began in 2011. An earth mass volume of approximately six million cubic metres was excavated for constructing the dam. The RCC dam is estimated to use 600,000m3 of concrete. The dam construction was more than 70% complete by the end of 2013.
Poyry was awarded a contract worth $3.9m in July 2011 for executing the detail design of the Beyhan I powerhouse and reviewing other structures of the project including the dam, penstocks, spillway, diversion structures, the bottom outlet, and the switchyard. Poyry executed the design work jointly with Temelsu.
Andritz Hydro was awarded a contract worth $60m in March 2012 for supplying the three Francis turbines.
Alstom, in April 2013, was awarded a $47m contract for supplying the 32MW environmental turbine-generator-unit, as well as the electrical equipment including power transformers, a 380kV switchyard, voltage systems, electrical protection system, and a complete automation system.
Voith was awarded a contract worth $53m in the same month for supplying the three generators.
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