  Power systems are large scale cyber-physical critical infrastructure that
form the basis of modern society. The reliability and resilience of the grid is
dependent on the correct functioning of related subsystems, including
computing, communications, and control. The integration is widespread and has a
profound impact on the operation, reliability, and efficiency of the grid.
Technologies comprising these infrastructure can expose new sources of threats.
Mapping these threats to their grid resilience impacts to stop them early
requires a timely and detailed view of the entire cyber-physical system. Grid
resilience must therefore be seen and addressed as a cyber-physical systems
problem. This short position paper presents several key preliminaries,
supported with evidence from experience, to enable cyber-physical situational
awareness and intrusion response through a cyber-physical energy management
system.
