County annual report · FIPS 06001
2025 Alameda County, CA Power Outage Report
In 2025, customers in Alameda County, CA went without power for an average of 2.8 hours, a total of 2.1M customer-hours (California average 7.6 hours). That ranks 52nd worst of 57 California counties and 2147th 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 Alameda 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 | February 7, 2025 15:45 | February 18, 2025 06:30 | 10d 14h | 11,925 | 53K |
| 2 | August 10, 2025 15:30 | August 20, 2025 12:00 | 9d 20h | 10,593 | 52K |
| 3 | January 6, 2025 15:15 | January 11, 2025 12:15 | 4d 21h | 9,137 | 84K |
| 4 | August 7, 2025 14:00 | August 10, 2025 13:30 | 2d 23h | 8,731 | 53K |
| 5 | August 20, 2025 15:30 | August 21, 2025 10:15 | 18h 45m | 8,706 | 17K |
| 6 | October 2, 2025 11:45 | October 4, 2025 13:30 | 2d 1h | 8,450 | 20K |
| 7 | October 25, 2025 14:00 | October 27, 2025 12:15 | 1d 22h | 8,294 | 6,905 |
| 8 | August 4, 2025 03:15 | August 5, 2025 12:00 | 1d 8h | 7,804 | 14K |
| 9 | September 9, 2025 12:30 | September 14, 2025 07:45 | 4d 19h | 7,549 | 38K |
| 10 | March 10, 2025 15:15 | March 17, 2025 14:00 | 6d 22h | 7,246 | 64K |
Outage episodes by size in 2025: 119 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 Alameda 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 |
| Alameda Municipal Power | 2024 | 55 min | 0.88 | 55 min | 0.88 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Port of Oakland | - | - | - | - | - |
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 ÷ 751,616 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. Alameda County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Alameda 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/alameda-county