County annual report · FIPS 06077
2021 San Joaquin County, CA Power Outage Report
In 2021, customers in San Joaquin County, CA went without power for an average of 6.2 hours, a total of 2.0M customer-hours (California average 6.6 hours). That ranks 36th worst of 57 California counties and 1119th of 2,974 nationally.
Compared with CA, the US and 2020
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Joaquin County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 25, 2021 15:30 | January 31, 2021 06:45 | 5d 15h | 56,870 | 1.3M |
| 2 | December 13, 2021 14:15 | December 20, 2021 06:15 | 6d 16h | 12,496 | 91K |
| 3 | July 21, 2021 14:30 | July 23, 2021 02:30 | 1d 12h | 11,608 | 13K |
| 4 | June 16, 2021 15:45 | June 20, 2021 20:45 | 4d 5h | 10,482 | 25K |
| 5 | November 19, 2021 16:00 | November 23, 2021 12:00 | 3d 20h | 7,536 | 19K |
| 6 | October 11, 2021 15:45 | October 13, 2021 10:45 | 1d 19h | 7,286 | 38K |
| 7 | January 15, 2021 08:45 | January 15, 2021 14:45 | 6h | 5,590 | 9,997 |
| 8 | March 8, 2021 14:30 | March 11, 2021 07:30 | 2d 17h | 4,546 | 13K |
| 9 | October 23, 2021 18:00 | October 27, 2021 04:00 | 3d 10h | 4,427 | 28K |
| 10 | May 30, 2021 15:30 | May 30, 2021 18:30 | 3h | 4,392 | 1,639 |
Outage episodes by size in 2021: 164 reached 100+ customers, 57 reached 1,000+ customers, 4 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving San Joaquin County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Pacific Gas & Electric Co. | 2021 | 10.4 hrs | 1.84 | 3.6 hrs | 1.32 |
| Modesto Irrigation District | 2021 | 87 min | 0.70 | 37 min | 0.46 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| City of Lodi - (CA) | - | - | - | - | - |
| Lathrop Irrigation District | - | - | - | - | - |
| Port of Stockton - (CA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 95% of California's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 324,543 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. San Joaquin County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), San Joaquin County, CA annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/california/san-joaquin-county