Power outage history
Montgomery County Pennsylvania
13hours
without power for the average customer in a typical year, 2018–2025
10th most of 67 in Pennsylvania 2.0× 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 Montgomery's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 29 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Montgomery, 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 |
|---|---|---|---|---|---|---|
| Jun 3, 2020 | Thunderstorms | 141,915 | 63% | 4.3 d | 2.9 d | 4.4M |
| Mar 2, 2018 | Winter storm | 123,280 | 55% | 3.3 d | 2.8 d | 4.3M |
| Jun 19, 2025 | Thunderstorms | 70,526 | 31% | 3.4 d | 2.3 d | 1.9M |
| Sep 1, 2021 | Hurricane Ida | 44,233 | 20% | 3.2 d | 2.7 d | 1.2M |
| Aug 4, 2020 | Hurricane Isaias | 65,880 | 29% | 2.1 d | 29 h | 1.0M |
| Jul 21, 2021 | Thunderstorms | 49,121 | 22% | 45 h | 26 h | 754k |
| Oct 31, 2019 | Thunderstorms | 43,192 | 19% | 2.6 d | 40 h | 747k |
| Feb 16, 2025 | Windstorm | 44,713 | 20% | 47 h | 24 h | 577k |
| Mar 5, 2018 | Winter storm | 16,142 | 7% | 2.9 d | 27 h | 466k |
| May 29, 2019 | Thunderstorms | 15,691 | 7% | 47 h | 47 h | 311k |
| Jun 23, 2015 | Thunderstorms | 14,939 | 7% | 31 h | 33 h | 208k |
| Jul 16, 2024 | Thunderstorms | 25,461 | 11% | 28 h | 26 h | 206k |
| Dec 25, 2020 | No storm report | 23,467 | 10% | 18 h | 1.2 h | 203k |
| Jan 9, 2024 | No storm report | 13,755 | 6% | 24 h | 23 h | 139k |
| Aug 7, 2023 | Thunderstorms | 12,063 | 5% | 23 h | 25 h | 134k |
| Dec 23, 2022 | Winter storm | 12,253 | 5% | 24 h | 25 h | 112k |
| Dec 19, 2025 | Thunderstorms | 12,820 | 6% | 23 h | 23 h | 97k |
| Feb 25, 2019 | Windstorm | 10,183 | 5% | 13 h | 11 h | 69k |
| Apr 3, 2016 | Windstorm | 11,254 | 5% | 11 h | 8.5 h | 67k |
| Apr 3, 2024 | No storm report | 9,126 | 4% | 11 h | 10 h | 55k |
| Jun 21, 2017 | Thunderstorms | 11,647 | 5% | 7.0 h | 6.2 h | 54k |
| Apr 15, 2025 | Thunderstorms | 11,943 | 5% | 7.8 h | 19 h | 50k |
| Jun 8, 2016 | Thunderstorms | 12,848 | 6% | 8.2 h | 8.5 h | 50k |
| May 15, 2018 | Thunderstorms | 15,575 | 7% | 7.2 h | 7.5 h | 49k |
| Feb 24, 2016 | Thunderstorms | 9,526 | 4% | 9.8 h | 14 h | 46k |
| Nov 2, 2018 | Thunderstorms | 7,225 | 3% | 15 h | 20 h | 45k |
| May 22, 2022 | Thunderstorms | 12,069 | 5% | 5.8 h | 7.0 h | 37k |
| Mar 1, 2025 | No storm report | 8,043 | 4% | 7.0 h | 8.0 h | 36k |
| Jul 22, 2018 | No storm report | 6,072 | 3% | 7.8 h | 13 h | 33k |
| Aug 9, 2024 | Hurricane Debby | 7,307 | 3% | 6.5 h | 16 h | 33k |
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 Montgomery from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 51%
- Winter storm 28%
- Tropical storm 13%
- No storm on record 4.6%
- Windstorm 3.8%
Who keeps the lights on
Utilities serving Montgomery
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 |
| PECO Energy Co | Investor Owned | 328 | 59 | 1.12 | 18.0 | 1.5M |
| PPL Electric Utilities Corp | Investor Owned | 198 | 116 | 0.97 | 18.6 | 1.3M |
| Borough of Lansdale | PA | – | – | – | 18.8 | 50k |
| Borough of Hatfield | PA | – | – | – | – | 11k |
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 224,080 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 →