Develop and validate a dynamics and protection simulation platform to enable utility planning, operations, and protection engineers to better understand and mitigate cascading blackouts involving protection. To realize this goal, the team will build upon the capabilities of ‘TS3ph’, a dynamics simulator developed through the DOE-OE AGMR funded project “High-fidelity ‘faster than real-time’ simulator for predicting power system dynamic behavior.” The project will focus on advancing the modeling, simulation, analysis, and visualization capabilities of TS3ph-CAPE through the following innovation pathways: Fill current industry modeling gaps, accelerate dynamics simulation, develop new analysis metrics, create new situational awareness capabilities, and validate and verify the developed dynamics simulator with standard industry tools, and observed data.