1. ABOUT THE DATASET ------------ Title: U.S. Daily Power Outages Creator(s): Isabelle Ariail[1][2] Organisation(s): 1. University of Reading. 2. Climate X Rights-holder(s): Climate X Publication Year: 2026 Description: The dataset includes daily power outage occurrences derived from the NOAA storm events database at state-level for the contiguous United States. Days containing an outage are denoted with ones, while non-outage days are denoted with zeros. It also includes the NOAA event type associated with each day, the grouped hazard type, and the main TSO operating within each state. Leap days have been excluded. Event types are the first event type associated with an outage on a given day, or for days with no outages, the first event type for that day. Cite as: Ariail, Isabelle (2026): U.S. Daily Power Outages. University of Reading. Dataset. https://doi.org/10.17864/1947.001484. Related publication: Ariail, I., Brayshaw, D. J., Williams, P. D., Woodhouse, S., & Leach, N. J. (2026). Weather and climate drivers of power outages over the continental U.S. Unpublished manuscript, submitted to the Journal of Applied Meteorology and Climatology. Contact: i.ariail@pgr.reading.ac.uk 2. TERMS OF USE ------------ Copyright 2026 Climate X. This dataset is licensed under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/. 3. PROJECT AND FUNDING INFORMATION ------------ Funding organisation: Climate X with additional funding from the Wilkie Calvert Studentship 4. CONTENTS ------------ US_daily_power_outages_1996_2024.csv - STATE: U.S. state name; only contiguous states included - TSO: Transmission System Operator associated with each state; if multiple then TSO with largest coverage by area taken - date: day/month/year - noaa_outage_count: 0 for non-outage days, 1 for days containing at least one outage - EVENT_TYPE: meteorological hazard associated with outage or in case of non-outage days, the first meteorological hazard on the day. All outage days should contain EVENT_TYPE but non-outage days may be left blank. - NOAA_CAT: event types grouped into seven categories: FLOOD, FOG, HEAT/ WILDFIRE, HURRICANE, THUNDERSTORM, WIND, WINTER 5. METHODS ----------- - Episode and event narrative text columns from NOAA storm events database (NOAA National Centers for Environmental Information, 2023) were parsed for the inclusion of key words pertaining to power outages ('outage', 'powerline', 'power line', 'power outage', 'lost power', 'electricity', 'wire', 'power ') - Data was collected from 1996-2024; first three years (1993, 1994, 1995) were dropped due to lower outage numbers compared to rest of the time period due to the recent addition of narrative columns - Nine event types were removed due to non-meteorological or indirect outage impacts: Drought, Debris Flow, Storm Surge/Tide, High Surf, Avalanche, Astronomical Low Tide, Rip Current, Dense Smoke, Tsunami - Further methodological details are provided in the mentioned manuscript currently under review NOAA National Centers for Environmental Information (NCEI). (2023). NOAA Storm Events Database. National Oceanic and Atmospheric Administration. https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc:C00510