County annual report · FIPS 06097
2021 Sonoma County, CA Power Outage Report
In 2021, customers in Sonoma County, CA went without power for an average of 8.6 hours, a total of 1.8M customer-hours (California average 6.6 hours). That ranks 28th worst of 57 California counties and 887th 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 Sonoma 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 | October 23, 2021 09:30 | November 1, 2021 00:45 | 8d 15h | 24,736 | 621K |
| 2 | January 4, 2021 13:15 | January 8, 2021 01:45 | 3d 12h | 20,532 | 88K |
| 3 | January 27, 2021 01:00 | February 10, 2021 10:00 | 14d 9h | 11,748 | 139K |
| 4 | September 1, 2021 11:45 | September 2, 2021 02:15 | 14h 30m | 8,648 | 10K |
| 5 | September 2, 2021 03:45 | September 3, 2021 01:00 | 21h 15m | 8,147 | 3,051 |
| 6 | December 13, 2021 15:30 | December 19, 2021 05:15 | 5d 13h | 7,025 | 67K |
| 7 | June 15, 2021 15:00 | June 17, 2021 08:00 | 1d 17h | 6,113 | 17K |
| 8 | July 31, 2021 14:00 | August 2, 2021 11:45 | 1d 21h | 6,103 | 13K |
| 9 | May 14, 2021 15:45 | May 15, 2021 00:00 | 8h 15m | 5,838 | 1,685 |
| 10 | August 27, 2021 06:45 | August 31, 2021 06:00 | 3d 23h | 5,832 | 22K |
Outage episodes by size in 2021: 201 reached 100+ customers, 65 reached 1,000+ customers, 3 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 Sonoma 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 |
| City of Healdsburg - (CA) | - | - | - | - | - |
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 ÷ 214,127 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. Sonoma County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sonoma 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/sonoma-county