County annual report · FIPS 06001
2020 Alameda County, CA Power Outage Report
In 2020, customers in Alameda County, CA went without power for an average of 3.9 hours, a total of 2.9M customer-hours (California average 6.3 hours). That ranks 44th worst of 57 California counties and 1639th of 3,019 nationally.
Compared with CA, the US and 2019
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Alameda County, 2020
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 8, 2020 16:45 | February 13, 2020 11:15 | 4d 18h | 55,472 | 603K |
| 2 | October 25, 2020 16:30 | October 28, 2020 10:45 | 2d 18h | 22,392 | 638K |
| 3 | August 14, 2020 15:15 | August 19, 2020 11:00 | 4d 19h | 19,413 | 307K |
| 4 | November 4, 2020 17:00 | November 14, 2020 19:15 | 10d 2h | 12,597 | 118K |
| 5 | September 23, 2020 23:45 | September 30, 2020 13:45 | 6d 14h | 10,690 | 69K |
| 6 | January 27, 2020 05:45 | February 1, 2020 10:15 | 5d 4h | 8,999 | 43K |
| 7 | April 7, 2020 14:00 | April 10, 2020 00:00 | 2d 10h | 8,498 | 19K |
| 8 | February 26, 2020 14:45 | February 27, 2020 09:45 | 19h | 8,308 | 17K |
| 9 | June 21, 2020 14:45 | June 24, 2020 12:30 | 2d 21h | 7,704 | 50K |
| 10 | June 17, 2020 14:00 | June 20, 2020 22:30 | 3d 8h | 7,126 | 17K |
Outage episodes by size in 2020: 273 reached 100+ customers, 88 reached 1,000+ customers, 5 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 2020, 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. | 2020 | 7.4 hrs | 1.34 | 2.3 hrs | 1.04 |
| Alameda Municipal Power | 2020 | 58 min | 0.88 | 58 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 94% of California's customers in 2020; 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, 2020, 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/2020/california/alameda-county