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In PSSe, there is no specific variable to id machine by technology. At ERCOT, machine id is used for that purpose:

Plants                              Unit_ID_Prefix  Unit_ID     Comment
Coal and Lignite                    L               L1  
Natural Gas except Combined Cycle   N               N1  
Combined Cycle                      C               C1          Gas unit
                                                    C0          Steam unit
Oil Fired                           O               O1  
Nuclear                             U               U1  
Hydro                               H               H1  
Wind                                W               W1  
Solar                               S               S1  
Renewables                          R               R1  
Distributed Generation              D               D1  
Battery Units                       BT              BT  
Synchronous Condenser               SC              SC  
FACTS Device                        F               F1  
Equivalent Network                  EQ              EQ  
Self Serve                          P               P1  
Self Serve Economic                 PE              PE  
Black Start Units                   BS              BS