Power outage history
Nassau County Florida
3.9hours
without power for the average customer in a typical year, 2018–2025
54th most of 67 in Florida 41% 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 Nassau'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 12 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Nassau, 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 |
|---|---|---|---|---|---|---|
| Sep 10, 2017 | Hurricane Irma | 48,802 | 93% | 8.8 d | 2.9 d | 2.0M |
| Sep 26, 2024 | Hurricane Helene | 31,083 | 59% | 2.4 d | 38 h | 464k |
| Oct 7, 2016 | Hurricane Matthew | 18,519 | 35% | 24 h | 31 h | 286k |
| Oct 8, 2016 | Hurricane Matthew | 8,358 | 16% | 2.1 d | 2.0 d | 142k |
| Jan 3, 2018 | Winter storm | 8,112 | 15% | 31 h | 15 h | 90k |
| Aug 30, 2023 | Hurricane Idalia | 11,255 | 21% | 26 h | 20 h | 79k |
| Jan 21, 2025 | Winter storm | 5,635 | 11% | 37 h | 31 h | 75k |
| Apr 19, 2019 | Thunderstorms | 13,152 | 25% | 12 h | 5.0 h | 35k |
| Aug 5, 2024 | Hurricane Debby | 3,283 | 6% | 28 h | 23 h | 25k |
| Feb 6, 2020 | Thunderstorms | 9,065 | 17% | 12 h | 5.2 h | 24k |
| May 10, 2024 | Thunderstorms | 2,938 | 6% | 15 h | 14 h | 22k |
| Sep 10, 2017 | Tropical storm | 2,953 | 6% | 10 h | 1.5 h | 14k |
| Jun 14, 2023 | Thunderstorms | 6,989 | 13% | 5.2 h | 3.5 h | 12k |
| Sep 30, 2017 | No storm report | 2,737 | 5% | 7.0 h | 5.2 h | 11k |
| Aug 23, 2015 | Thunderstorms | 16,192 | 31% | 1.8 h | 1.5 h | 10k |
| Sep 2, 2016 | Hurricane Hermine | 3,185 | 6% | 4.8 h | 4.0 h | 8.6k |
| Mar 21, 2018 | No storm report | 16,334 | 31% | 48 min | 30 min | 8.5k |
| Nov 10, 2022 | Hurricane Nicole | 1,809 | 3% | 5.0 h | – | 7.8k |
| Sep 28, 2020 | No storm report | 8,331 | 16% | 3.0 h | 30 min | 6.1k |
| Jun 13, 2023 | Thunderstorms | 3,209 | 6% | 5.5 h | 12 min | 6.1k |
| Aug 4, 2020 | No storm report | 2,842 | 5% | 4.2 h | 6.2 h | 5.6k |
| Sep 30, 2017 | No storm report | 1,684 | 3% | 8.0 h | – | 5.4k |
| Dec 10, 2023 | No storm report | 3,176 | 6% | 2.5 h | 2.2 h | 5.2k |
| Aug 6, 2017 | Thunderstorms | 1,950 | 4% | 3.8 h | – | 5.1k |
| Feb 25, 2020 | No storm report | 1,589 | 3% | 3.2 h | – | 4.9k |
| Nov 10, 2022 | Hurricane Nicole | 2,131 | 4% | 3.2 h | – | 4.8k |
| Jul 23, 2023 | Thunderstorms | 2,682 | 5% | 3.2 h | 4.0 h | 4.7k |
| Jun 2, 2018 | Thunderstorms | 1,585 | 3% | 6.5 h | – | 4.4k |
| May 31, 2017 | Thunderstorms | 2,919 | 6% | 4.0 h | 2.2 h | 4.4k |
| Sep 29, 2022 | Hurricane Ian | 2,228 | 4% | 2.0 h | – | 4.3k |
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 Nassau from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tropical storm 51%
- No storm on record 25%
- Winter storm 14%
- Thunderstorms 10%
Who keeps the lights on
Utilities serving Nassau
As each utility reports to the Energy Information Administration for its whole Florida territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Florida Power & Light Co | Investor Owned | 47 | 45 | 0.46 | 14.6 | 5.3M |
| JEA | Municipal | 49 | 49 | 0.95 | 13.8 | 479k |
| Florida Public Utilities Co | Investor Owned | 167 | 129 | 1.93 | 17.8 | 26k |
| Okefenoke Rural El Member Corp | Cooperative | 479 | 250 | 3.73 | 14.0 | 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
- Charlton, GA 15 h
- Camden, GA 9.1 h
- Baker 6.8 h
- Nassau (this county) 3.9 h
- Duval 2.2 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 52,493 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 →