The generalized first principle model is created based on GE’s proprietary Applications for Packaged Powered Solutions (APPS) software package. APPS includes physics models that have been developed specifically by GE to model their aeroderivative gas turbines. However, the models are tuned based on locally collected turbine test data. In addition to being highly accurate upon installation, GE’s PEMS solution includes a calibration feature— which can be used to adjust the model output based on tuning adjustments derived from temporary CEMS and corresponding turbine data sets. This calibration feature enables improved accuracy and extends the time between calibrations. Our PEMS solution requires the System 1 and Bently PERFORMANCE* software applications. Together, these two packages provide an accurate estimate of cumulative CO2 generated over user-specified time periods such as consecutive monthly time intervals. Furthermore, Bently PERFORMANCE provides calculated or derived PEMS input parameters that may not be available online (i.e., unavailable measurements).