How Blackouts during Heat Waves Amplify Mortality and Morbidity Risk

• Published in: Environmental science & technology Vol. 57; no. 22; pp. 8245 - 8255
• Main Authors: Stone, Brian, Gronlund, Carina J., Mallen, Evan, Hondula, David, O’Neill, Marie S., Rajput, Mayuri, Grijalva, Santiago, Lanza, Kevin, Harlan, Sharon, Larsen, Larissa, Augenbroe, Godfried, Krayenhoff, E. Scott, Broadbent, Ashley, Georgescu, Matei
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 06.06.2023
• Subjects: Albedo; Blackout; canopy; Cities; Climate; Energy and Climate; environmental science; Exposure; Extreme weather; Failure; Health risks; Heat; Heat waves; Hot Temperature; infrastructure; Morbidity; Mortality; risk; Roofing; Roofing materials; technology; Temperature; trees; urban population; Urban populations; weather; extreme heat event; urban heat management; infrastructure failure events; infrastructure failure; heat-related mortality; compound climat; climate change
• ISSN: 0013-936X; 1520-5851; 1520-5851
• DOI: 10.1021/acs.est.2c09588

The recent concurrence of electrical grid failure events in time with extreme temperatures is compounding the population health risks of extreme weather episodes. Here, we combine simulated heat exposure data during historical heat wave events in three large U.S. cities to assess the degree to which heat-related mortality and morbidity change in response to a concurrent electrical grid failure event. We develop a novel approach to estimating individually experienced temperature to approximate how personal-level heat exposure changes on an hourly basis, accounting for both outdoor and building-interior exposures. We find the concurrence of a multiday blackout event with heat wave conditions to more than double the estimated rate of heat-related mortality across all three cities, and to require medical attention for between 3% (Atlanta) and more than 50% (Phoenix) of the total urban population in present and future time periods. Our results highlight the need for enhanced electrical grid resilience and support a more spatially expansive use of tree canopy and high albedo roofing materials to lessen heat exposures during compound climate and infrastructure failure events.