  Prolonged power outages debilitate the economy and threaten public health.
Existing research is generally limited in its scope to a single event, an
outage cause, or a region. Here, we provide one of the most comprehensive
analyses of U.S. power outages for 2002--2019. We categorized all outage data
collected under U.S. federal mandates into four outage causes and computed
industry-standard reliability metrics. Our spatiotemporal analysis reveals six
of the most resilient U.S. states since 2010, improvement of power resilience
against natural hazards in the south and northeast regions, and a
disproportionately large number of human attacks for its population in the
Western Electricity Coordinating Council region. Our regression analysis
identifies several statistically significant predictors and hypotheses for
power resilience. Furthermore, we propose a novel framework for analyzing
outage data using differential weighting and influential points to better
understand power resilience. We share curated data and code as Supplementary
Materials.
