County annual report · FIPS 06081
2018 San Mateo County, CA Power Outage Report
In 2018, customers in San Mateo County, CA went without power for an average of 1.3 hours, a total of 434K customer-hours (California average 3.7 hours). That ranks 45th worst of 57 California counties and 2176th 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 Mateo 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 | December 9, 2018 17:15 | December 10, 2018 06:00 | 12h 45m | 33,771 | 43K |
| 2 | June 13, 2018 04:45 | June 14, 2018 08:45 | 1d 4h | 9,515 | 21K |
| 3 | August 13, 2018 13:30 | August 15, 2018 13:45 | 2d | 8,434 | 6,419 |
| 4 | July 24, 2018 15:30 | July 28, 2018 06:45 | 3d 15h | 6,316 | 10K |
| 5 | November 28, 2018 14:30 | December 2, 2018 13:00 | 3d 22h | 5,217 | 26K |
| 6 | September 7, 2018 16:45 | September 8, 2018 14:45 | 22h | 4,918 | 4,003 |
| 7 | July 13, 2018 14:30 | July 15, 2018 21:45 | 2d 7h | 3,989 | 2,526 |
| 8 | December 14, 2018 15:15 | December 16, 2018 07:15 | 1d 16h | 3,908 | 20K |
| 9 | June 28, 2018 15:45 | June 29, 2018 13:00 | 21h 15m | 3,881 | 6,610 |
| 10 | November 23, 2018 03:00 | November 28, 2018 09:00 | 5d 6h | 3,870 | 8,455 |
Outage episodes by size in 2018: 123 reached 100+ customers, 35 reached 1,000+ customers, 1 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 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 |
| 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 91% of California's customers in 2018; 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, 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-mateo-county