During its 20-30 years of operation, a gas turbine combined cycle (GTCC) power generation facility faces various changes in the business environment such as societal shifts (e.g. environmental regulations and decarbonization) and competition from new power source technologies. Maintaining the facility's competitiveness requires not only proper maintenance, but also continuous adoption of latest technologies to improve performance and operability. Such needs from the customer have increased year by year. As an OEM, Mitsubishi Heavy Industries, Ltd. (MHI) has developed state-of-the-art, advanced technologies for new constructions and implements upgrades which can be flowed down to existing power generation facilities. MHI has recently been developing service programs in response to the diverse and ever-changing needs of the market, by identifying effective menu contents through marketing analysis. As a result, a wide-range of upgrade programs, including those for higher thermal efficiency to achieve better performance (which contributes not only to economic efficiency but also to the realization of a carbon-neutral society), as well as improved start up time and operation flexibility (which allow power generation facilities to adapt to a renewable energy society). Here, cases of actual application are presented.
