De-energization as maladaptation: Uneven residential exposure to wildfire Public Safety Power Shutoffs and compound heat.

In response to growing levels of wildfire destruction, electric utility companies are adopting powerline de-energization as an adaptation strategy intended to prevent wildfire ignitions. While reducing wildfire risk, planned de-energizations also expose residents to electricity loss, potentially causing harmful consequences. We investigated the extent to which planned de-energization can be considered a form of maladaptation, in which an adaptive response to a climate-related hazard results in unintended, concurrent harms. To do so, we examined the co-occurrence of Public Safety Power Shutoffs (PSPSs) with extreme heat (temperature ≥ 32 °C) in California between October 2021 and September 2024. Our analysis revealed compound heat-PSPS outages throughout this period, including extreme temperatures exceeding 40 °C, during power shutoffs. Compound heat-PSPS events were geographically concentrated in census block groups with higher proportions of older adults and mobile home residents, both populations which may be at increased risk of heat-related morbidity and mortality. While they affected a relatively small proportion of customers de-energized by PSPSs, compound heat-PSPS outages raise concerns over extreme heat exposure when access to electricity-based cooling strategies is curtailed. Evaluating the maladaptive effects of institutional responses to climate change hazards is critical for comprehensively weighing both the benefits and harms of emerging adaptation strategies.