The GE PEMS Solution Today, most offshore platforms perform an emissions test using temporarily placed equipment on an as-needed basis. The lack of any type of models prevents the extension of these tests to other operating regimes (e.g., different ambient conditions) resulting in poor emission estimates. The System 1 PEMS software solution for gas turbines is based on the first principle fundamental engine emissions model developed by GE. Ambient conditions, various turbine operating parameters, and fuel properties are model inputs. The model is valid for both gas and diesel fuels and computes emissions estimates for NOx, CO and unburned hydrocarbons, while providing calculated values for CO2 and SO2.