Client: Kenan Electricity
Total Installed Capacity 37 MW
Pülümür Weir and HEPP is a diversion type hydroelectric facility that is planned over Pülümür Stream in Tunceli province. In the original formulation, the project was a run-of-the river type dam project, but with the preparation and evaluation of “Pülümür HEPP Project Expropriation Preliminary Investigation Report” within the scope of feasibility studies, the construction of a dam is found to be uneconomical and so the project is converted to a weir type project.
In the original formulation, the project was a dam type project with 65 m height and 264 hm3 reservoir nearby Tunceli City Center. As a result of “Pülümür HEPP Project Expropriation Preliminary Investigation Report” that is prepared within the scope of feasibility studies, it is seen that the expropriation cost is about 50 Mil.$ and with this cost the project is unfeasible and different alternatives are studied. Finally it is decided to construct the project as a diversion type project with a weir, power tunnel, surge tank, penstock and a powerhouse.
Pülümür HEPP project has a RCC weir with 22 m height (from thalweg) and 42 m crest length. The spillway is designed with Q500 flood discharge which is 1 022.67 m3/s. In order to maximize the energy generation, the highest possible head is achieved by keeping the operating water level same as the flood level with a 7 radial gate-controlled-spillway. The weir has an active storage of 3 hm3 to carry out the daily regulation.
The water taken with water intake structure is diverted into settling basin and then into the power tunnel. The 4.5 km long power tunnel has 2 access tunnels. The tunnel diameter is 4.40 m with 30 cm concrete line. Before the powerhouse, a surge tank will be constructed in order to absorb waterhammer effects. The circular surge tank has a shaft with 6 m diameter and an upper- chamber of 30 m diameter. A steel penstock of 320 m long and 4.00 m diameter connects the surge tank to the powerhouse. In the powerhouse there are two horizontal axis Francis turbines with a total capacity of 23.30 MW.