Mitsubishi Heavy Industries, Ltd. (MHI) has developed the large capacity and high efficiency gas turbines, M701G1 with 1450℃ class turbine inlet gas temperature. M701G1 gas turbines have applied the basic structure of 1350℃ class M501F/M701F gas turbines which have abundant operating experiences and high reliability. In addition, the advanced technologies obtained from various component tests to satisfy a demand for higher turbine inlet gas temperature have been also applied at development and design stages. Tohoku Electric Power Co., Higashi Niigata Thermal Power Plant #4 is the exhaust heat recovery type large capacity combined cycle power plant having more than 50% themal efficiency (HHV base). MHI's M701G1 gas turbines were installed in this plant as the main power generation engines, and started commerical operation in July 1999. Now, this plant is being successfully operated.
