County annual report · FIPS 06013
2021 Contra Costa County, CA Power Outage Report
In 2021, customers in Contra Costa County, CA went without power for an average of 4.3 hours, a total of 2.1M customer-hours (California average 6.6 hours). That ranks 44th worst of 57 California counties and 1471st 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 Contra Costa 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 | September 19, 2021 01:30 | September 21, 2021 10:15 | 2d 8h | 20,039 | 219K |
| 2 | October 21, 2021 05:00 | October 28, 2021 10:45 | 7d 5h | 16,244 | 237K |
| 3 | September 8, 2021 15:15 | September 12, 2021 08:45 | 3d 17h | 13,472 | 150K |
| 4 | December 18, 2021 15:45 | December 25, 2021 23:15 | 7d 7h | 11,850 | 27K |
| 5 | September 5, 2021 06:00 | September 6, 2021 09:15 | 1d 3h | 11,352 | 25K |
| 6 | January 25, 2021 03:15 | January 29, 2021 09:00 | 4d 5h | 10,458 | 99K |
| 7 | June 19, 2021 13:15 | June 21, 2021 08:45 | 1d 19h | 9,905 | 15K |
| 8 | September 6, 2021 11:00 | September 8, 2021 14:15 | 2d 3h | 9,288 | 25K |
| 9 | May 18, 2021 13:45 | May 20, 2021 06:00 | 1d 16h | 8,905 | 6,945 |
| 10 | October 18, 2021 00:15 | October 18, 2021 17:30 | 17h 15m | 7,678 | 47K |
Outage episodes by size in 2021: 185 reached 100+ customers, 90 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 Contra Costa 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
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 ÷ 486,945 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. Contra Costa County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Contra Costa 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/contra-costa-county