All power plant engineers face the problem of peak power demands. Pumped storage plants are used to generate peak load power by pumping up water utilizing off-peak energy of hydrothermal and thermonuclear plants. This accessible text/reference covers hydroelectric power generation with emphasis on engineering to meet peak power demands by means of pumped storage plants, fidal power plants, and low head power generation. The text covers hydrology, mechanical and electrical equipment, accessories such as penstocks and valves, and civil engineering considerations. It contains descriptions of several existing plants.