As of early 2024, the latest commercial release of Siemens Power System Simulator for Engineering (PSS®E) is .
PSS®E continues to be the "industry standard" for a wide range of analytical functions: PSS®E Version 36 - Siemens psse latest version
The single biggest change in the latest PSSE is the native handling of and Grid-Forming (GFM) Inverters . As of early 2024, the latest commercial release