Power outage history
Pinal County Arizona
1.8hours
without power for the average customer in a typical year, 2018–2025
5th most of 11 in Arizona 72% below 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 Pinal's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2022 was the worst well-recorded year, at 3.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Pinal, 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 |
|---|---|---|---|---|---|---|
| Jul 17, 2022 | Windstorm | 10,905 | 5% | 2.4 d | 2.3 d | 457k |
| Jul 9, 2018 | Thunderstorms | 16,371 | 8% | 13 h | 4.2 h | 96k |
| Jul 9, 2021 | Thunderstorms | 15,541 | 7% | 11 h | 10 h | 83k |
| Jul 10, 2021 | Thunderstorms | 14,975 | 7% | 7.5 h | 6.2 h | 67k |
| Aug 8, 2021 | No storm report | 2,356 | 1% | 16 h | – | 35k |
| Aug 25, 2025 | Windstorm | 8,576 | 4% | 4.0 h | 2.5 h | 25k |
| Sep 11, 2022 | Thunderstorms | 6,661 | 3% | 4.2 h | 2.8 h | 23k |
| Jul 30, 2018 | Flooding | 12,044 | 6% | 5.0 h | 5.8 h | 23k |
| Oct 16, 2024 | No storm report | 3,429 | 2% | 6.2 h | – | 21k |
| Oct 9, 2024 | No storm report | 5,722 | 3% | 3.8 h | 3.8 h | 21k |
| Aug 21, 2025 | Windstorm | 5,892 | 3% | 5.0 h | 4.2 h | 19k |
| Jul 14, 2024 | Windstorm | 4,687 | 2% | 5.8 h | – | 18k |
| Aug 5, 2018 | No storm report | 3,876 | 2% | 4.8 h | – | 18k |
| Sep 30, 2019 | No storm report | 3,517 | 2% | 5.8 h | – | 18k |
| Aug 11, 2015 | Thunderstorms | 6,085 | 3% | 3.5 h | 2.5 h | 16k |
| Aug 31, 2023 | Thunderstorms | 5,224 | 2% | 4.5 h | 4.8 h | 15k |
| Jan 25, 2023 | No storm report | 7,552 | 3% | 2.0 h | 48 min | 15k |
| Sep 1, 2022 | Thunderstorms | 7,300 | 3% | 5.8 h | 6.2 h | 14k |
| Oct 19, 2022 | No storm report | 7,839 | 4% | 1.8 h | 1.5 h | 14k |
| Aug 20, 2020 | Heat | 4,693 | 2% | 3.8 h | – | 14k |
| Aug 16, 2021 | Thunderstorms | 6,129 | 3% | 2.2 h | 1.5 h | 12k |
| Feb 3, 2025 | No storm report | 5,740 | 3% | 2.0 h | 4.5 h | 11k |
| Sep 2, 2022 | Thunderstorms | 6,192 | 3% | 2.8 h | 2.2 h | 11k |
| Sep 1, 2025 | Windstorm | 5,646 | 3% | 2.2 h | 1.5 h | 11k |
| Aug 8, 2018 | Heat | 2,949 | 1% | 5.2 h | – | 11k |
| Oct 22, 2015 | No storm report | 4,169 | 2% | 2.5 h | – | 10k |
| Jun 17, 2025 | No storm report | 4,620 | 2% | 2.2 h | – | 10k |
| Aug 10, 2018 | Windstorm | 6,701 | 3% | 1.8 h | 1.8 h | 10.0k |
| Sep 23, 2024 | No storm report | 4,885 | 2% | 2.0 h | – | 9.3k |
| Aug 18, 2022 | No storm report | 2,772 | 1% | 3.2 h | – | 8.9k |
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 Pinal from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Windstorm 40%
- Thunderstorms 26%
- No storm on record 25%
- Heat 5.3%
- Flooding 2.5%
- Winter storm 0.6%
- Wildfire 0.5%
Who keeps the lights on
Utilities serving Pinal
As each utility reports to the Energy Information Administration for its whole Arizona territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Arizona Public Service Co | Investor Owned | 73 | 73 | 0.84 | 17.0 | 1.3M |
| Salt River Project | Political Subdivision | 66 | 50 | 1.02 | 14.0 | 1.1M |
| Trico Electric Cooperative Inc | Cooperative | 90 | 66 | 0.73 | 14.3 | 54k |
| Electrical Dist No3 Pinal County | Political Subdivision | 30 | 30 | 0.42 | 14.0 | 33k |
| Tohono O'Odham Utility Authority | AZ | – | – | – | – | 31k |
| Hohokam Irr & Drain Dist | AZ | – | – | – | – | 23k |
| Electrical Dist No4 Pinal County | AZ | – | – | – | 12.3 | 20k |
| USBIA-San Carlos Project | Federal | – | – | – | 16.4 | 12k |
| Electrical Dist No2 Pinal County | Political Subdivision | 141 | 115 | 1.65 | 13.3 | 5.6k |
| Gila River Indian Utility Authority (GRICUA) | Cooperative | 264 | 264 | 6.27 | 14.3 | 2.7k |
| Ak-Chin Electric Utility Authority | State | – | – | – | 12.9 | 319 |
| WAPA-- Western Area Power Administration | Federal | – | – | – | – | – |
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.
Next door
Neighbouring counties
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 216,962 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 →