County annual report · FIPS 06001
2018 Alameda County, CA Power Outage Report
In 2018, customers in Alameda County, CA went without power for an average of 1.0 hours, a total of 719K customer-hours (California average 3.7 hours). That ranks 50th worst of 57 California counties and 2325th of 2,798 nationally.
Compared with CA, the US and 2017
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Alameda County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 20, 2018 05:30 | December 1, 2018 11:30 | 11d 6h | 14,255 | 104K |
| 2 | December 24, 2018 06:00 | December 25, 2018 09:15 | 1d 3h | 7,485 | 28K |
| 3 | November 2, 2018 14:30 | November 5, 2018 00:00 | 2d 9h | 7,030 | 14K |
| 4 | August 24, 2018 13:30 | August 25, 2018 04:15 | 14h 45m | 6,745 | 13K |
| 5 | August 14, 2018 09:45 | August 15, 2018 11:15 | 1d 1h | 6,058 | 5,498 |
| 6 | June 16, 2018 14:30 | June 25, 2018 06:30 | 8d 16h | 6,025 | 37K |
| 7 | September 6, 2018 14:30 | September 7, 2018 23:00 | 1d 8h | 5,571 | 14K |
| 8 | August 28, 2018 10:45 | August 30, 2018 12:45 | 2d 2h | 5,564 | 14K |
| 9 | November 16, 2018 15:30 | November 18, 2018 05:30 | 1d 14h | 5,228 | 8,125 |
| 10 | June 28, 2018 15:15 | July 4, 2018 13:15 | 5d 22h | 4,637 | 26K |
Outage episodes by size in 2018: 122 reached 100+ customers, 47 reached 1,000+ customers, 1 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 2018, 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. | 2018 | 5.0 hrs | 1.18 | 2.1 hrs | 1.08 |
| Alameda Municipal Power | 2018 | 34 min | 0.83 | - | - |
| 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 91% of California's customers in 2018; 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, 2018, 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/2018/california/alameda-county