Gas turbines have reached a point in their development where they are becoming the preferred choice for utility and industrial power generation applications. In the last decade, this power generation technology has evolved rapidly both in terms of unit rating and in performance. The successful commercialization of the “F” (2350F [1288C] class) machine is the most recent step in this evolution. Although more “F” technology has been a significant accomplishment, it must be viewed as just one step in the evolution of gas turbine power generation systems to advanced conditions. As this development trend continues, these power generation systems will be under increasing pressure to meet tighter emission standards and to accommodate lower-grade fuels. Active development programs are now in place to meet both of these challenges. Dry Low NOx (DLN) combustion systems on advanced gas turbines will permit operation at even higher temperatures while controlling emissions. An integrated gasification gas turbine combined cycle (IGCC) using low-grade fuels — coal, residual oil, and biomass — is now approaching commercial status. The technology base for continuing the development of these gas turbine power generation systems far into the future exists and/or is under development. The DOE sponsored Advanced Turbine System Program is a key element in the development and ultimate commercial demonstration of this Next Generation System.