County annual report · FIPS 06001
2021 Alameda County, CA Power Outage Report
In 2021, customers in Alameda County, CA went without power for an average of 3.2 hours, a total of 2.4M customer-hours (California average 6.6 hours). That ranks 50th worst of 57 California counties and 1769th of 2,974 nationally.
Compared with CA, the US and 2020
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Alameda County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 17, 2021 14:45 | June 20, 2021 06:00 | 2d 15h | 51,898 | 82K |
| 2 | January 26, 2021 14:45 | January 30, 2021 07:30 | 3d 16h | 21,281 | 178K |
| 3 | January 19, 2021 04:15 | January 23, 2021 13:30 | 4d 9h | 20,779 | 164K |
| 4 | October 17, 2021 18:00 | October 18, 2021 17:30 | 23h 30m | 16,153 | 112K |
| 5 | October 21, 2021 05:00 | October 29, 2021 10:00 | 8d 5h | 13,775 | 172K |
| 6 | September 19, 2021 05:15 | September 21, 2021 11:00 | 2d 5h | 10,040 | 63K |
| 7 | October 21, 2021 03:15 | October 21, 2021 04:15 | 1h | 9,927 | 4,428 |
| 8 | November 26, 2021 00:45 | November 29, 2021 01:45 | 3d 1h | 9,132 | 14K |
| 9 | October 31, 2021 15:45 | November 6, 2021 08:30 | 5d 16h | 8,232 | 94K |
| 10 | November 20, 2021 14:15 | November 23, 2021 09:00 | 2d 18h | 8,183 | 32K |
Outage episodes by size in 2021: 170 reached 100+ customers, 97 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 Alameda County reported on EIA Form 861 for 2021, 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. | 2021 | 10.4 hrs | 1.84 | 3.6 hrs | 1.32 |
| Alameda Municipal Power | 2021 | 27 min | 0.33 | 27 min | 0.33 |
| 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 95% of California's customers in 2021; 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, 2021, 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/2021/california/alameda-county