Power outage history
Dallas County Texas
9.5hours
without power for the average customer in a typical year, 2018–2025
124th most of 240 in Texas 1.4× the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Dallas's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2021 was the worst well-recorded year, at 21 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Dallas, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Feb 15, 2021 | Winter storm | 358,650 | 38% | 4.6 d | 2.3 d | 17M |
| May 28, 2024 | Thunderstorms | 386,856 | 41% | 5.1 d | 3.7 d | 15M |
| Jun 9, 2019 | Thunderstorms | 313,327 | 33% | 3.2 d | 2.4 d | 10M |
| Oct 20, 2019 | Tornadoes | 83,944 | 9% | 2.9 d | 2.9 d | 2.4M |
| Sep 4, 2022 | Thunderstorms | 120,548 | 13% | 29 h | 25 h | 1.6M |
| Mar 4, 2025 | Thunderstorms | 107,071 | 11% | 35 h | 34 h | 1.4M |
| Mar 2, 2023 | Thunderstorms | 105,907 | 11% | 22 h | 20 h | 822k |
| Aug 16, 2020 | Thunderstorms | 50,830 | 5% | 16 h | 18 h | 396k |
| May 26, 2024 | Windstorm | 45,815 | 5% | 11 h | 16 h | 258k |
| Mar 13, 2019 | Thunderstorms | 48,020 | 5% | 11 h | 11 h | 230k |
| Oct 28, 2021 | Windstorm | 28,904 | 3% | 11 h | 20 h | 212k |
| Jun 8, 2025 | Thunderstorms | 25,466 | 3% | 13 h | 20 h | 190k |
| Jul 12, 2020 | Thunderstorms | 34,893 | 4% | 7.5 h | 12 h | 176k |
| May 18, 2019 | Thunderstorms | 33,147 | 4% | 8.5 h | 16 h | 170k |
| Jun 11, 2023 | Thunderstorms | 24,173 | 3% | 11 h | 18 h | 147k |
| May 26, 2015 | Flooding | 23,536 | 2% | 11 h | 19 h | 137k |
| Oct 10, 2019 | Thunderstorms | 21,892 | 2% | 10 h | 20 h | 123k |
| Jun 16, 2019 | Tornadoes | 28,158 | 3% | 7.5 h | 13 h | 111k |
| May 24, 2015 | Tornadoes | 16,423 | 2% | 5.0 h | 12 h | 55k |
| Jun 9, 2015 | Thunderstorms | 16,243 | 2% | 5.2 h | 16 h | 55k |
| Aug 30, 2019 | No storm report | 17,750 | 2% | 3.5 h | 7.5 h | 50k |
| Mar 17, 2021 | Thunderstorms | 23,467 | 2% | 3.0 h | 13 h | 50k |
| May 29, 2015 | Flooding | 17,311 | 2% | 4.2 h | 10 h | 43k |
| Sep 8, 2023 | Heat | 16,042 | 2% | 3.5 h | 16 h | 42k |
| Oct 10, 2021 | Thunderstorms | 23,485 | 2% | 2.8 h | 12 h | 41k |
| Jun 2, 2022 | Thunderstorms | 11,167 | 1% | 4.8 h | 12 h | 41k |
| Jun 19, 2020 | Thunderstorms | 11,297 | 1% | 5.8 h | 16 h | 41k |
| Jun 23, 2019 | Thunderstorms | 18,883 | 2% | 2.8 h | 14 h | 41k |
| Sep 5, 2025 | Thunderstorms | 14,683 | 2% | 3.2 h | 12 h | 39k |
| May 2, 2022 | No storm report | 12,115 | 1% | 3.5 h | 13 h | 38k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Dallas from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 61%
- Winter storm 33%
- Tornadoes 4.9%
- Windstorm 0.9%
- No storm on record 0.6%
Who keeps the lights on
Utilities serving Dallas
As each utility reports to the Energy Information Administration for its whole Texas territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Farmers Electric Coop, Inc | Cooperative | 91 | 66 | 1.35 | 11.9 | 88k |
| Trinity Valley Elec Coop Inc | Cooperative | 179 | 142 | 2.36 | 12.2 | 82k |
| City of Garland | Municipal | 13 | 17 | 0.20 | 13.7 | 71k |
| HILCO Electric Cooperative, Inc. | Cooperative | 212 | 175 | 1.76 | 14.8 | 28k |
| Oncor Electric Delivery Company LLC | Investor Owned | 232 | 67 | 1.55 | – | – |
| Texas-New Mexico Power Co | Investor Owned | 165 | 119 | 1.50 | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 948,355 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →