County annual report · FIPS 06091
2021 Sierra County, CA Power Outage Report
In 2021, customers in Sierra County, CA went without power for an average of 121.6 hours, a total of 252K customer-hours (California average 6.6 hours). That ranks 5th worst of 57 California counties and 53rd 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 Sierra 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 | December 24, 2021 15:30 | December 31, 2021 00:15 | 6d 8h | 1,595 | 99K |
| 2 | January 19, 2021 07:15 | January 21, 2021 23:00 | 2d 15h | 1,260 | 36K |
| 3 | May 21, 2021 03:00 | May 21, 2021 05:45 | 2h 45m | 1,240 | 3,410 |
| 4 | May 25, 2021 20:00 | May 25, 2021 22:30 | 2h 30m | 988 | 2,470 |
| 5 | September 27, 2021 00:45 | September 27, 2021 22:15 | 21h 30m | 908 | 17K |
| 6 | January 27, 2021 03:30 | February 5, 2021 01:00 | 8d 21h | 775 | 19K |
| 7 | August 18, 2021 00:45 | August 18, 2021 08:30 | 7h 45m | 768 | 5,837 |
| 8 | June 25, 2021 01:30 | June 25, 2021 05:15 | 3h 45m | 761 | 2,474 |
| 9 | October 25, 2021 17:45 | October 27, 2021 23:45 | 2d 6h | 750 | 7,714 |
| 10 | October 7, 2021 22:00 | October 8, 2021 00:15 | 2h 15m | 740 | 559 |
Outage episodes by size in 2021: 33 reached 100+ customers, 3 reached 1,000+ customers, 0 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 Sierra 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 |
| Liberty Utilities | 2021 | 16.8 hrs | 4.60 | 11.7 hrs | 3.86 |
| Plumas-Sierra Rural Elec Coop | - | - | - | - | - |
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 ÷ 2,072 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. Sierra County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sierra 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/sierra-county