Importance of SMES Cost Reductions

Abstract

In the field of applying superconducting technology to electric power, superconducting magnetic energy storage (SMES) features highly efficient electric power storage as well as high-speed energy storage and output in comparison with conventional energy storage equipment. With superior qualities of this kind, SMES is expected to bring about a wide range of benefits, such as a stabilization of the power system, maintenance of power quality, and power load leveling. However, extensive R & D for SMES is required to achieve further cost reductions because many issues are yet to be resolved with respect to cost-performance and practicality. Given this situation, a 5-year national government project was started in 1999, focused on the development of cost reductions for small-scale SMES associated with power system control to meet market needs and soon become feasible. This paper outlines the ongoing R & D under the national governmental project, the need for cost reductions, and the study results of marginal costs, which can accommodate SMES costperformance.