Gas-turbine combined-cycle power generation is expected to lead to a long-term extension
of power-generation markets by providing the most clean and economic thermal power plants
which coexist with renewable energy. We are developing technologies for 1700°C-class gas
turbines as part of a national project to further improve the performance, and some of the latest
developed technologies have been applied to the development of the world’s first 1600°C-class
J-series gas turbine and next-generation high-efficiency gas turbines.1 In this article, the
technology development status, together with examples of technologies developed toward the
application of next-generation 1700°C-class gas turbines, is described.