Pumped storage hydro electricity pdf

Pumped hydroelectricity storage phs is the oldest kind of largescale energy storage and works on a very simple principletwo reservoirs at different altitudes are required and when the water is released from the upper reservoir to the lower reservoir, energy is created by the downflow, which is directed through a turbine and generator to create electricity. Pumped hydro employs offpeak electricity to pump water from a reservoir up to another reservoir at a higher elevation. Currently, the most common type of utilityscale storage is pumped storage hydro psh. Role of pumped storage hydro resources in electricity. The majority of the nations 20 gw of psh was established in the mid to late 1970s asce 1993 in response to a significant increase in oil and gas prices as well as concerns about the security of supply denholm 2010. Pumped hydroelectric storage phes is currently the most widely used storage method, which corresponds to over 99% of the worlds bulk energy storage capacity 52. Pumped storage hydropower plants psh are designed to lift water to a reservoir at higher elevation when the electricity demand is low or when prices are low, and turbine water to.

In pumping mode, electric energy is converted to potential energy and stored in the form of water at an upper elevation, which is why it is sometimes called a water battery. The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation. Pumped hydrostorage is the only electricity storage system considered in this study. The hydraulic design of these elements has great bearing on both the safety and operational efficiency of the project. As shown on figure 1, pumped storage projects store electricity by moving. The hydraulic design basis for a pumped storage project is concerned with the configuration and sizing of works such as intake structures, penstocks, hydraulic machinery, water passages, and spillways. Lowcost surplus offpeak electric power is typically used to run the pumps. Pumpedstorage hydroelectricity psh, or pumped hydroelectric energy storage phes, is a type of hydroelectric energy storage used by electric power systems for load balancing. Pumped storage hydropower is a modified use of conventional hydropower technology to store and manage energy or electricity. Pumped storage hydropower projects use electricity to store potential energy by moving water between an upper and lower reservoir. The shares of renewable energies will gain in future, therefore sustainable investments in pumped storage hydropower will be needed to ensure system stability and supply security. Secretary of energy conduct a study on pumped storage hydropower psh and potential hydropower from conduits. Pumped storage report national hydropower association.