Power outage history
San Joaquin County California
4.0hours
without power for the average customer in a typical year, 2018–2025
45th most of 56 in California 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 San Joaquin's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2023 was the worst well-recorded year, at 9.5 hours for the average customer. Hatched years have a thin record and are left out of the averages.
San Joaquin, 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 |
|---|---|---|---|---|---|---|
| Dec 31, 2022 | Flooding | 43,541 | 13% | 3.1 d | 45 h | 1.3M |
| Jan 26, 2021 | Windstorm | 56,870 | 18% | 46 h | 29 h | 1.3M |
| Jan 7, 2023 | Flooding | 40,830 | 13% | 42 h | 31 h | 772k |
| Feb 4, 2024 | Windstorm | 46,271 | 14% | 30 h | 20 h | 537k |
| Jun 19, 2025 | No storm report | 61,218 | 19% | 16 h | 12 h | 529k |
| Apr 23, 2019 | No storm report | 18,357 | 6% | 13 h | 10 h | 140k |
| Jan 6, 2019 | No storm report | 13,959 | 4% | 23 h | 21 h | 114k |
| Feb 20, 2022 | No storm report | 18,389 | 6% | 6.5 h | 6.2 h | 79k |
| May 25, 2022 | Heat | 17,457 | 5% | 7.2 h | 7.2 h | 67k |
| Dec 13, 2021 | Windstorm | 12,496 | 4% | 6.0 h | 6.0 h | 59k |
| Mar 30, 2024 | No storm report | 11,785 | 4% | 4.8 h | 2.8 h | 52k |
| Aug 29, 2022 | No storm report | 17,717 | 5% | 2.8 h | 1.2 h | 49k |
| Jan 17, 2024 | No storm report | 6,407 | 2% | 7.2 h | 4.5 h | 46k |
| Aug 16, 2020 | Wildfire | 11,368 | 4% | 6.2 h | 12 h | 41k |
| Oct 27, 2019 | Windstorm | 8,013 | 2% | 9.2 h | 30 min | 37k |
| Jul 25, 2023 | No storm report | 17,816 | 5% | 2.0 h | 1.2 h | 34k |
| Jan 19, 2023 | No storm report | 14,412 | 4% | 2.8 h | 2.8 h | 32k |
| Feb 5, 2022 | No storm report | 9,692 | 3% | 3.2 h | 3.2 h | 31k |
| Jan 10, 2023 | Flooding | 5,873 | 2% | 6.0 h | 1.0 h | 30k |
| Aug 19, 2022 | No storm report | 6,540 | 2% | 4.5 h | 12 h | 29k |
| Oct 11, 2021 | Windstorm | 7,286 | 2% | 5.2 h | 5.2 h | 24k |
| Aug 6, 2022 | No storm report | 6,392 | 2% | 4.5 h | 2.8 h | 24k |
| Jan 14, 2023 | Flooding | 7,409 | 2% | 4.5 h | 5.8 h | 23k |
| Apr 2, 2024 | No storm report | 8,185 | 3% | 2.2 h | 2.2 h | 18k |
| Mar 28, 2022 | No storm report | 5,672 | 2% | 3.5 h | 5.8 h | 17k |
| Jan 28, 2025 | No storm report | 5,738 | 2% | 2.8 h | 1.2 h | 15k |
| Jun 18, 2021 | Heat | 10,482 | 3% | 2.0 h | 2.0 h | 15k |
| Nov 21, 2023 | No storm report | 4,172 | 1% | 3.5 h | – | 14k |
| Jul 7, 2023 | No storm report | 5,725 | 2% | 2.8 h | 3.2 h | 14k |
| Dec 31, 2022 | Flooding | 4,244 | 1% | 3.2 h | – | 13k |
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 San Joaquin from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Flooding 37%
- Windstorm 33%
- No storm on record 27%
- Heat 2.4%
- Wildfire 0.9%
Who keeps the lights on
Utilities serving San Joaquin
As each utility reports to the Energy Information Administration for its whole California territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Pacific Gas & Electric Co. | Investor Owned | 273 | 208 | 1.63 | 37.5 | 5.1M |
| Modesto Irrigation District | Political Subdivision | 36 | 31 | 0.43 | 23.0 | 105k |
| City of Lodi | Municipal | 72 | 22 | 0.53 | 22.8 | 24k |
| Lathrop Irrigation District | CA | – | – | – | – | 8.4k |
| WAPA-- Western Area Power Administration | Federal | – | – | – | – | – |
| Port of Stockton | CA | – | – | – | – | – |
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
- Calaveras 70 h
- Amador 52 h
- Contra Costa 4.6 h
- San Joaquin (this county) 4.0 h
- Sacramento 3.9 h
- Alameda 3.6 h
- Stanislaus 0.4 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 324,543 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 →