Power outage history
Cortland County New York
4.1hours
without power for the average customer in a typical year, 2018–2025
48th most of 62 in New York 38% 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 Cortland's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2024 was the worst well-recorded year, at 10 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Cortland, 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 19, 2022 | Winter storm | 3,236 | 14% | 2.7 d | 8.5 h | 91k |
| Jul 15, 2024 | Thunderstorms | 2,593 | 11% | 2.7 d | 2.6 d | 69k |
| Jul 10, 2024 | Thunderstorms | 5,534 | 23% | 21 h | 19 h | 52k |
| Mar 16, 2025 | No storm report | 6,507 | 27% | 13 h | 1.0 h | 32k |
| Aug 9, 2024 | Hurricane Debby | 2,536 | 11% | 22 h | 15 h | 20k |
| Nov 22, 2024 | Winter storm | 1,314 | 5% | 36 h | 28 h | 20k |
| May 18, 2017 | No storm report | 2,079 | 9% | 20 h | 18 h | 15k |
| Jul 17, 2021 | Thunderstorms | 1,693 | 7% | 18 h | 15 h | 13k |
| Jun 24, 2024 | No storm report | 4,305 | 18% | 5.8 h | 4.8 h | 13k |
| Jan 11, 2017 | No storm report | 2,840 | 12% | 10 h | 5.8 h | 13k |
| Jan 9, 2024 | No storm report | 2,117 | 9% | 16 h | 14 h | 12k |
| Sep 7, 2023 | Thunderstorms | 1,530 | 6% | 9.5 h | 8.2 h | 11k |
| Mar 1, 2021 | No storm report | 1,296 | 5% | 10 h | 8.8 h | 10k |
| Oct 31, 2019 | Thunderstorms | 4,550 | 19% | 4.5 h | 1.8 h | 9.8k |
| Jun 29, 2021 | Thunderstorms | 1,047 | 4% | 10 h | – | 8.0k |
| Aug 13, 2016 | No storm report | 555 | 2% | 21 h | – | 7.1k |
| Jun 12, 2015 | Thunderstorms | 1,074 | 4% | 11 h | – | 6.9k |
| Sep 25, 2017 | No storm report | 8,105 | 34% | 1.0 h | 1.0 h | 6.8k |
| May 10, 2015 | Thunderstorms | 1,750 | 7% | 8.0 h | 2.0 h | 6.6k |
| Dec 9, 2023 | No storm report | 2,987 | 12% | 7.5 h | 2.5 h | 6.3k |
| Sep 1, 2018 | No storm report | 3,006 | 13% | 2.0 h | 48 min | 6.0k |
| Jan 9, 2016 | No storm report | 883 | 4% | 11 h | – | 6.0k |
| Feb 17, 2022 | No storm report | 4,936 | 21% | 2.2 h | 2.0 h | 5.5k |
| Jul 21, 2018 | No storm report | 899 | 4% | 6.5 h | – | 5.4k |
| Jul 7, 2025 | Thunderstorms | 1,255 | 5% | 7.5 h | 7.0 h | 5.2k |
| Feb 3, 2019 | No storm report | 544 | 2% | 11 h | – | 5.1k |
| Jul 13, 2021 | Thunderstorms | 1,193 | 5% | 5.0 h | – | 4.9k |
| Dec 1, 2019 | Winter storm | 2,384 | 10% | 3.0 h | 2.8 h | 4.8k |
| Oct 9, 2016 | No storm report | 1,149 | 5% | 5.2 h | – | 4.6k |
| Jun 13, 2019 | No storm report | 3,033 | 13% | 1.5 h | 1.2 h | 4.5k |
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 Cortland from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 40%
- Thunderstorms 34%
- Winter storm 21%
- Tropical storm 4.1%
Who keeps the lights on
Utilities serving Cortland
As each utility reports to the Energy Information Administration for its whole New York territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Niagara Mohawk Power Corp. | Investor Owned | 242 | 140 | 1.39 | 19.9 | 1.5M |
| New York State Elec & Gas Corp | Investor Owned | 302 | 146 | 1.85 | 22.6 | 794k |
| Village of Marathon | NY | – | – | – | – | 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.
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 23,943 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 →