County annual report · FIPS 06081
2022 San Mateo County, CA Power Outage Report
In 2022, customers in San Mateo County, CA went without power for an average of 3.8 hours, a total of 1.2M customer-hours (California average 4.9 hours). That ranks 41st worst of 57 California counties and 1710th of 2,976 nationally.
Compared with CA, the US and 2021
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Mateo County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 7, 2022 04:00 | May 10, 2022 02:00 | 2d 22h | 15,867 | 9,220 |
| 2 | June 21, 2022 14:00 | June 25, 2022 10:00 | 3d 20h | 15,014 | 187K |
| 3 | October 20, 2022 03:30 | October 28, 2022 13:30 | 8d 10h | 11,893 | 33K |
| 4 | December 30, 2022 16:15 | January 1, 2023 00:00 | 1d 7h | 8,301 | 35K |
| 5 | December 6, 2022 15:30 | December 15, 2022 04:45 | 8d 13h | 8,285 | 55K |
| 6 | January 30, 2022 17:45 | February 2, 2022 11:30 | 2d 17h | 7,673 | 24K |
| 7 | January 26, 2022 14:30 | January 28, 2022 06:30 | 1d 16h | 7,071 | 11K |
| 8 | July 18, 2022 13:30 | July 21, 2022 11:00 | 2d 21h | 6,665 | 16K |
| 9 | July 6, 2022 14:45 | July 8, 2022 03:30 | 1d 12h | 6,410 | 4,626 |
| 10 | April 10, 2022 09:45 | April 17, 2022 12:15 | 7d 2h | 6,103 | 55K |
Outage episodes by size in 2022: 175 reached 100+ customers, 74 reached 1,000+ customers, 3 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 Mateo County reported on EIA Form 861 for 2022, 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. | 2022 | 5.4 hrs | 1.78 | 4.3 hrs | 1.63 |
| City & County of San Francisco | - | - | - | - | - |
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 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 328,408 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 Mateo County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), San Mateo County, CA annual power outage report, 2022, 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/2022/california/san-mateo-county