High-Altitude Electromagnetic Pulse (HEMP) refers to the electromagnetic pulse that is created by high-altitude detonation of a nuclear weapon. Numerous stakeholders assert that a HEMP attack is probable, and its impact would be catastrophic to the power system infrastructure. However, a science-based approach is needed to assess the true impact of the threat. To address this gap, EPRI has developed a comprehensive research plan that will be carried out over a three-year period. This video provides an overview of science of high-altitude electromagnetic pulses and EPRI’s three-year research plan. From Electric Power Research Institute.