While Pumped Hydro Storage has many advantages, it also has some challenges that need to be addressed. One of the primary challenges is that it requires a large amount of space. The two reservoirs need to be large enough to store significant amounts of water, and the pipes and turbines used in the system also require space.
Pumped Hydro Storage is also a relatively expensive technology to build. The construction costs can be high, particularly if the system needs to be built in a remote or difficult-to-access location. Another advantage of pumped hydro storage is that it is very flexible. The system can be turned on and off quickly, allowing it to respond to changes in demand very rapidly. This makes it an ideal technology for balancing the grid during times of high demand.
Read More @ https://cmiblogpost.weebly.com/article/pumped-hydro-storage-used-to-produce-power-as-water-discharges-passing-from-a-turbine