County annual report · FIPS 06081
2023 San Mateo County, CA Power Outage Report
In 2023, customers in San Mateo County, CA went without power for an average of 22.9 hours, a total of 7.5M customer-hours (California average 7.9 hours). That ranks 15th worst of 57 California counties and 333rd of 2,977 nationally.
Compared with CA, the US and 2022
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Mateo County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 1, 2023 13:00 | March 19, 2023 04:30 | 17d 15h | 67,816 | 1.9M |
| 2 | February 21, 2023 15:30 | March 1, 2023 07:30 | 7d 16h | 62,792 | 1.9M |
| 3 | May 15, 2023 14:15 | May 17, 2023 12:00 | 1d 21h | 51,416 | 52K |
| 4 | March 19, 2023 05:30 | March 27, 2023 12:15 | 8d 6h | 45,982 | 1.0M |
| 5 | January 1, 2023 00:00 | January 10, 2023 01:00 | 9d 1h | 42,670 | 1.4M |
| 6 | January 10, 2023 12:45 | January 10, 2023 19:00 | 6h 15m | 19,500 | 100K |
| 7 | September 26, 2023 08:30 | September 28, 2023 04:45 | 1d 20h | 9,856 | 14K |
| 8 | March 27, 2023 14:30 | April 8, 2023 12:30 | 11d 22h | 9,056 | 49K |
| 9 | January 31, 2023 14:30 | February 8, 2023 12:30 | 7d 22h | 7,528 | 43K |
| 10 | October 12, 2023 15:15 | October 14, 2023 06:00 | 1d 14h | 7,434 | 15K |
Outage episodes by size in 2023: 139 reached 100+ customers, 62 reached 1,000+ customers, 6 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 2023, 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. | 2023 | 11.9 hrs | 2.22 | 4.3 hrs | 1.56 |
| 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 n/a of California's customers in 2023; 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, 2023, 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/2023/california/san-mateo-county