Mitsubishi Hitachi Power Systems, Ltd. (MHPS) has continued to contribute to the
preservation of the global environment and the stable supply of energy through constant gas
turbine development based on our abundant operating results, research and verification of state of
the art technology. In recent years, using development results from the "1700°C Class
Ultrahigh-Temperature Gas Turbine Component Technology Development" national project that
we have participated in since 2004, MHPS has successfully developed the highly-efficient M501J,
which achieved the world's first turbine inlet temperature of 1600°C, and started verifying
operations using the verification facility in the MHPS Takasago Works in 2011. Thereafter, the
M501J has been delivered all over the world, and has accumulated operating results. In addition,
to further improve the efficiency of the gas turbine combined cycle power generation (GTCC) and
enhance the operability, we replaced the steam-cooled system for the cooling of the combustor and
developed a new enhanced air-cooled system. This paper presents the development and
operational situation of the state-of-the-art, high-efficiency gas turbine of MHPS and the
development of the next-generation 1650°C class JAC (J Air Cooled) gas turbine using an
enhanced air-cooled system as the core technology based on the technology adopted for the
M501J.
