The 70101 50Hz Combustion Turbine continues a long line of large heavy-duty single-shaft combustion turbines by combining the proven efficient and reliable concepts of the 50IF and 70W. The output of the 70101 is 255MW with combined cycle net efficiency of over 57%. A part of component development was conducted under the joint development program with Tohoku Electric Power Co., Inc. and a part of the design work was carried out under the cooperation with Westinghouse Electric Corporation in the

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... U.S.k. and Fiat Avio in Italy. This gas turbine is going to be installed to "Higashi Niigata Power Plants NO.4" of Tohoku Electric Power Co., Inc. in Japan. This plant will begin commercial operation in 1999. This paper describes some design results and new technologies in designing and developing this next generation I500°C class advanced gas turbine.