Power systems are disclosed. The power system may include a turbine component of a gas turbine system, and a computing device(s) in communication with the power plant. The computing device(s) may be configured to control the power plant system by performing various processes including defining a turbine inlet temperature range for a combustion gas flowing through the turbine component of the gas turbine system. The turbine inlet temperature range may be based on a desired operational load for the power plant system. The processes performed by the computing device(s) may also include determining fuel and maintenance cost ranges based on the turbine inlet temperature range, calculating a desired turbine inlet temperature range for the combustion gas based on the determined fuel and maintenance cost range, and adjusting an actual turbine inlet temperature of the combustion gas to be within the calculated, desired turbine inlet temperature range.