Pumped storage systems (PSS) is the largest worldwide battery system to store excess energy and manage the balance between electricity consumption and production. Using the Francis turbine as a turbine or pump makes the development of PSS feasible and economically accepted. Pumped storage is classified as low-, medium-, and high-head power plants. It needs two separate vertical reservoirs. In the case of using the sea as a lower reservoir, we reduce the construction cost and improve the system viability by an illimited reservoir. The coastline line areas are suitable for implementing these systems with very interesting altitudes (up to 400 m). The erosion due to the seawater depends on velocity distribution in the blade-to-blade section from the hub to the shroud section. For the pump, the erosion rate is as high as the trailing edge where the absolute velocity is high.