This is a great session for power engineers and those involved in substations to watch. It is an extremely technical session by Dr. Chee-Wooi Ten of Michigan Technological University.
The key point is actually easy to understand. The most critical substations to secure may not be the highest voltage substations, and this session provides a set of mathematical equations to perform an impact analysis to identify the most critical substations.
Dr. Ten gets into the modeling and mathematics in significant detail in the video.