LAHORE: The Water and Power Development Authority (WAPDA) has successfully carried out simultaneous load rejection test of all the three units of Tarbela 4th Extension hydropower project.
The test was conducted at the load of about 1,100MW under the supervision of the consultants and the contractor of the project.
The simultaneous load rejection test was aimed at testing the stability of underwater parts and rise in speed and pressure of the turbines.
Simultaneous load rejection test is carried out once a hydropower project is
complete and its all generating units are fully operational.
Turbine efficiency test was also carried out last week under the supervision of the international expert, hired for the purpose.
The test ascertained that the turbine efficiency was more than the efficiency envisaged during the model testing of the turbines.
The completion of Tarbela 4th Extension and Neelum Jhelum hydropower projects this year has exerted positive impact on the overall hydel generation, as it surged to 5,241MW during the peak hours on November 23, 2018, registering an increase of around 46 percent as compared to 3,581MW generated on this day last year.
Since its commissioning, Tarbela 4th Extension hydropower project has so far contributed 1.26 billion units of low-cost hydel electricity to the national grid, despite low flows of water this year.
The 1,410MW Tarbela 4th Extension hydropower project has been constructed on Tunnel No 4 of Tarbela Dam.
The project has three generating units, each of them having capacity of 470MW. The project will provide on an average 3.84 billion units per annum to the national grid.
Annual benefits of the project have been estimated at Rs30 billion. With the completion of Tarbela 4th Extension hydropower project, the installed capacity of Tarbela hydel power station has increased from 3,478MW to 4,888MW.