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A new application of SMES (superconducting energy storage) for on-line grasping of power system stability is proposed. Experiment was carried out on a power system simulator with actual rotating generator models, which is a property of Central Research Institute of Electric Power Industry (CRIEPI), Japan. SMES system was designed and developed. Small power deviation of known pattern was generated by SMES and, by means of system identification, eigen-value of the power system was analysed from system response due to the power modulation. It was successful in evaluating the stability by eigen-values measured with the proposed method.