1. A method of monitoring the performance of a power generating unit, comprising: determining performance indication data including numerous values of a primary performance indication for the power generating unit at numerous different times within a time period during which the power generating unit is operating; collecting operating parameter data including numerous values for each of a plurality operating parameters of the power generating unit within the time period; performing a correlation analysis on performance indication data and the operating parameter data to determine a correlation between each of the plurality of operating parameters and the primary performance indication; determining from the correlation analysis a subset of the operating parameters that most affect the primary performance indication for the power generating unit; and altering the control of one or more of the subset of operating parameters during subsequent operation of the power generating unit based on the correlation analysis to thereby enhance the primary performance indication during subsequent operation of the power generation unit.