As of April 2026, the latest major release of Siemens PSS/E (Power System Simulator for Engineering) is Version 36, with Version 37 planned for release later this year. Major industry entities like AEMO and Hydro-Québec are currently transitioning to Version 36 to address the security risks and performance limitations of older versions. Key Improvements in Version 36

1. Native 64-bit Architecture

Previous versions (32-bit) were limited to 4 GB of RAM, causing crashes when simulating large networks (over 20,000 buses). PSSE 35.0+ is fully 64-bit, allowing access to terabytes of RAM. This means you can run:

Common Errors After Upgrading (And Fixes)

Many users encounter these issues when moving to PSSE latest version:

Python Integration: PSS®E continues to deepen its Python support. Recent versions offer well-documented APIs and specific tools like psse_env_manager to automate the building of user-defined models [11, 34].

Validation: The paper validates its PSS/E models by comparing them against high-fidelity electromagnetic transient models in PSCAD, demonstrating how to bridge the gap between positive-sequence and EMT-level simulations. PSS E – transmission planning and analysis - Siemens