County annual report · FIPS 06077
2018 San Joaquin County, CA Power Outage Report
In 2018, customers in San Joaquin County, CA went without power for an average of 0.8 hours, a total of 272K customer-hours (California average 3.7 hours). That ranks 53rd worst of 57 California counties and 2372nd of 2,798 nationally.
Compared with CA, the US and 2017
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Joaquin County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 26, 2018 15:30 | September 28, 2018 03:45 | 1d 12h | 6,387 | 9,742 |
| 2 | November 23, 2018 04:45 | November 24, 2018 23:45 | 1d 19h | 6,090 | 7,155 |
| 3 | September 10, 2018 13:30 | September 11, 2018 06:45 | 17h 15m | 3,964 | 1,691 |
| 4 | July 10, 2018 14:15 | July 13, 2018 06:00 | 2d 15h | 3,621 | 12K |
| 5 | July 8, 2018 01:30 | July 9, 2018 09:45 | 1d 8h | 3,301 | 2,871 |
| 6 | June 10, 2018 05:00 | June 11, 2018 09:15 | 1d 4h | 3,292 | 17K |
| 7 | August 5, 2018 13:45 | August 5, 2018 22:30 | 8h 45m | 2,709 | 5,315 |
| 8 | December 24, 2018 15:30 | December 25, 2018 09:30 | 18h | 2,440 | 4,776 |
| 9 | November 20, 2018 16:45 | November 21, 2018 10:30 | 17h 45m | 2,399 | 920 |
| 10 | August 6, 2018 12:15 | August 9, 2018 13:30 | 3d 1h | 2,377 | 9,414 |
Outage episodes by size in 2018: 123 reached 100+ customers, 30 reached 1,000+ customers, 0 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 2018, 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. | 2018 | 5.0 hrs | 1.18 | 2.1 hrs | 1.08 |
| Modesto Irrigation District | 2018 | 28 min | 0.43 | - | - |
| 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 91% of California's customers in 2018; 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, 2018, 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/2018/california/san-joaquin-county