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Gas turbine performance, especially power output and efficiency, is strongly dependent on ambient air temperature. Gas Turbine Inlet Air Cooling (GTIAC) has the effect of enhancing gas turbine capacity during peak hours in summer season. This paper presents an unique GTIAC system with liquid air, which will produce and store liquid air during off peak periods and spray it directly into the compressor inlet during peak hours. In the summer of 1996, an experimental study using a 150MW base load gas turbine was successfully performed on Chita Power Station to prove this new GTIAC performance. Test results show that the new GTIAC has a big advantage of increasing gas turbine capacity flexibly and economically for peak demands or emergencies.