A comprehensive analysis of power outages during weather events across the contiguous United States reveals significant variations in outage duration and severity based on hazard type and local characteristics. Researchers examined over 124,000 documented weather events spanning November 2014 through November 2022, integrating historical outage data with weather records and county-level infrastructure, demographic, and environmental information to identify patterns affecting grid reliability.
The study found that outage impacts vary dramatically by weather hazard. Tropical cyclones emerged as the most severe threat, producing outages 5.4 times longer and 17.8 times more severe than median single-hazard events. Co-occurring weather phenomena—such as wind paired with heavy rain—compounded impacts, with nearly 90 percent of hazard combinations resulting in both longer duration and greater severity compared to isolated events.
Local geographic and infrastructural features significantly influenced outage characteristics. Highly developed urban and suburban areas generally experienced shorter but more disruptive outages, while regions containing energy corridors faced more severe impacts during weather events. Notably, affluent counties demonstrated resilience advantages, with both shorter durations and lower severity, likely reflecting better-maintained infrastructure and faster restoration resources. Forested areas in outlying regions proved particularly vulnerable during wind-driven events, experiencing prolonged and severe outages due to vegetation-related transmission line failures.
These findings underscore the need for differentiated resilience strategies across geography and infrastructure type. Grid operators can leverage these insights to prioritize hardening investments in vulnerable corridors, preposition repair crews in forested wind-prone regions, and develop hazard-specific restoration protocols. The systematic correlation between local features and outage outcomes provides utilities with actionable guidance for enhancing grid strength against increasingly severe weather patterns. As climate change intensifies weather volatility, county-level resilience planning informed by these empirical patterns becomes essential for maintaining reliable power delivery.
