County annual report · FIPS 06081
2025 San Mateo County, CA Power Outage Report
In 2025, customers in San Mateo County, CA went without power for an average of 6.5 hours, a total of 2.1M customer-hours (California average 7.6 hours). That ranks 32nd worst of 57 California counties and 1222nd of 3,000 nationally.
Compared with CA, the US and 2024
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in San Mateo County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 14, 2025 16:45 | January 19, 2025 13:00 | 4d 20h | 36,840 | 146K |
| 2 | December 8, 2025 02:45 | December 10, 2025 05:15 | 2d 2h | 22,754 | 40K |
| 3 | December 23, 2025 12:15 | December 31, 2025 12:15 | 8d | 18,374 | 395K |
| 4 | March 12, 2025 09:30 | March 15, 2025 13:00 | 3d 3h | 15,094 | 72K |
| 5 | February 2, 2025 18:00 | February 9, 2025 02:15 | 6d 8h | 14,562 | 141K |
| 6 | March 22, 2025 04:15 | March 24, 2025 13:00 | 2d 8h | 11,150 | 13K |
| 7 | November 15, 2025 15:30 | November 20, 2025 05:00 | 4d 13h | 9,276 | 53K |
| 8 | May 15, 2025 20:30 | May 20, 2025 13:30 | 4d 17h | 9,145 | 49K |
| 9 | September 4, 2025 16:15 | September 6, 2025 00:15 | 1d 8h | 8,921 | 17K |
| 10 | July 6, 2025 11:00 | July 8, 2025 12:00 | 2d 1h | 8,337 | 17K |
Outage episodes by size in 2025: 167 reached 100+ customers, 83 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 2025, 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. | 2024 | 8.5 hrs | 2.15 | 4.6 hrs | 1.82 |
| 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 2025; 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, 2025, 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/2025/california/san-mateo-county