NTPC Koldam Hydro Power Project is on river Satluj in distt. Bilaspur, Himachal Pradesh. Koldam, the flagship Hydro Power Project of NTPC, has an installed capacity of 800 MW ( 4×200 MW) and provides the much needed peaking capacity to the Northern grid and annually generates 3054 GWh electricity.
As we know that when a dam is in operational, the water flows at a very high speed/pressure to the turbine through the penstock. During this process, some silt also comes along with the water. This slit was causing high friction inside the spiral casing. To control this loss, NTPC decided to apply 500 micron ceramic coating inside the casing.