Power outage history
Allegheny County Pennsylvania
6.1hours
without power for the average customer in a typical year, 2018–2025
38th most of 67 in Pennsylvania close to 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 Allegheny's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 25 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Allegheny, 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 |
|---|---|---|---|---|---|---|
| Apr 29, 2025 | Thunderstorms | 270,977 | 41% | 7.1 d | 2.9 d | 14M |
| Feb 24, 2019 | Windstorm | 58,700 | 9% | 2.9 d | 2.6 d | 1.8M |
| Jun 17, 2024 | Thunderstorms | 84,962 | 13% | 43 h | 37 h | 1.0M |
| Dec 29, 2024 | No storm report | 55,570 | 8% | 20 h | 18 h | 744k |
| Nov 15, 2018 | Winter storm | 29,490 | 4% | 30 h | 30 h | 509k |
| Apr 8, 2020 | Thunderstorms | 29,006 | 4% | 21 h | 27 h | 330k |
| Aug 12, 2021 | Thunderstorms | 31,137 | 5% | 16 h | 15 h | 303k |
| Apr 1, 2023 | Thunderstorms | 36,724 | 6% | 16 h | 18 h | 269k |
| Aug 27, 2020 | Thunderstorms | 31,345 | 5% | 17 h | 11 h | 261k |
| Jun 13, 2021 | Thunderstorms | 25,092 | 4% | 21 h | 26 h | 201k |
| Jul 7, 2021 | Thunderstorms | 27,219 | 4% | 13 h | 15 h | 189k |
| Mar 25, 2023 | Windstorm | 20,672 | 3% | 17 h | 27 h | 165k |
| Jul 4, 2018 | Thunderstorms | 20,647 | 3% | 13 h | 17 h | 163k |
| Nov 20, 2024 | Thunderstorms | 26,040 | 4% | 9.0 h | 17 h | 140k |
| Nov 15, 2020 | Thunderstorms | 23,118 | 3% | 12 h | 20 h | 123k |
| Aug 25, 2023 | Thunderstorms | 21,123 | 3% | 9.0 h | 13 h | 99k |
| Jul 10, 2024 | Hurricane Beryl | 22,065 | 3% | 5.5 h | 14 h | 75k |
| Dec 23, 2022 | Winter storm | 17,017 | 3% | 5.8 h | 9.2 h | 66k |
| Aug 16, 2016 | Thunderstorms | 9,449 | 1% | 7.5 h | 7.0 h | 65k |
| Aug 4, 2017 | Thunderstorms | 21,424 | 3% | 4.5 h | 10 h | 63k |
| Dec 5, 2024 | No storm report | 19,762 | 3% | 5.0 h | 6.0 h | 63k |
| Apr 17, 2024 | Thunderstorms | 13,925 | 2% | 5.8 h | 4.5 h | 61k |
| May 2, 2017 | No storm report | 13,581 | 2% | 5.0 h | 15 h | 55k |
| Mar 7, 2022 | Thunderstorms | 14,674 | 2% | 4.5 h | 7.8 h | 55k |
| Mar 16, 2025 | Thunderstorms | 13,911 | 2% | 5.2 h | 11 h | 52k |
| Jul 23, 2022 | Thunderstorms | 15,211 | 2% | 4.5 h | 15 h | 51k |
| Mar 26, 2021 | Windstorm | 11,567 | 2% | 5.0 h | 5.8 h | 48k |
| Jun 10, 2020 | Thunderstorms | 12,121 | 2% | 5.0 h | 13 h | 45k |
| Dec 29, 2025 | No storm report | 11,573 | 2% | 5.0 h | 7.5 h | 45k |
| May 1, 2017 | Thunderstorms | 14,736 | 2% | 3.5 h | 8.0 h | 44k |
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 Allegheny from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 82%
- Windstorm 9.5%
- No storm on record 5.0%
- Winter storm 2.7%
Who keeps the lights on
Utilities serving Allegheny
As each utility reports to the Energy Information Administration for its whole Pennsylvania territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| FirstEnergy Pennsylvania Electric Co | Investor Owned | 647 | 217 | 2.02 | 18.8 | 1.8M |
| Duquesne Light Co | Investor Owned | 856 | 103 | 1.27 | 23.5 | 553k |
| Central Electric Coop, Inc | Cooperative | – | – | – | 16.9 | 24k |
| Borough of Tarentum | PA | – | – | – | – | 15k |
| Borough of Pitcairn | PA | – | – | – | – | 9.5k |
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
- Butler 8.1 h
- Washington 7.5 h
- Beaver 6.5 h
- Allegheny (this county) 6.1 h
- Westmoreland 6.1 h
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 667,166 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 →