County annual report · FIPS 06081
2020 San Mateo County, CA Power Outage Report
In 2020, customers in San Mateo County, CA went without power for an average of 4.1 hours, a total of 1.4M customer-hours (California average 6.3 hours). That ranks 42nd worst of 57 California counties and 1583rd of 3,019 nationally.
Compared with CA, the US and 2019
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Mateo County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 13, 2020 13:00 | September 20, 2020 05:15 | 37d 16h | 36,697 | 470K |
| 2 | June 24, 2020 09:15 | June 26, 2020 11:00 | 2d 1h | 20,500 | 15K |
| 3 | July 14, 2020 14:30 | July 16, 2020 07:15 | 1d 16h | 9,734 | 6,807 |
| 4 | February 5, 2020 14:15 | February 14, 2020 13:00 | 8d 22h | 9,553 | 66K |
| 5 | December 10, 2020 21:00 | December 10, 2020 21:30 | 30m | 7,509 | 1,938 |
| 6 | June 30, 2020 10:30 | July 2, 2020 04:45 | 1d 18h | 6,515 | 13K |
| 7 | July 4, 2020 20:15 | July 5, 2020 07:30 | 11h 15m | 5,188 | 1,317 |
| 8 | July 16, 2020 13:00 | July 17, 2020 02:00 | 13h | 4,941 | 2,841 |
| 9 | January 9, 2020 12:45 | January 13, 2020 16:30 | 4d 3h | 4,649 | 10K |
| 10 | March 15, 2020 10:45 | March 15, 2020 13:45 | 3h | 4,636 | 5,944 |
Outage episodes by size in 2020: 251 reached 100+ customers, 66 reached 1,000+ customers, 2 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 2020, 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. | 2020 | 7.4 hrs | 1.34 | 2.3 hrs | 1.04 |
| 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 94% of California's customers in 2020; 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, 2020, 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/2020/california/san-mateo-county