Abstract
Underground Pumped Hydroelectric Storage (UPHS) is a technique for supplying electric power to meet peak load requirements. Presently there are not any existing UPHS plants, either operating or under construction. Studies indicate that the UPHS concept is technically feasible and economically viable. This paper describes conceptual design parameters, plant layout, turbomachinery options, site-selection considerations, geological requirements, economics, and environmental concerns. Most elements of UPHS technology are sufficiently developed to enable plant construction. Advances in high head turbomachinery design and geotechnical excavation techniques are expected to enhance the economic attractiveness of UPHS.
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