High-altitude electromagnetic pulse describes a nuclear detonation over land that could potentially cause damage to large transformers and substations. However, there are differing opinions on just how catastrophic an event such as this might be. As a result, EPRI launched a three-year research initiative in 2016 to investigate these events, including threat assessment, mitigation, and recovery. EPRI Vice President of Transmission and Distribution, Rob Manning, sits down to discuss findings so far and research that is ongoing.