County annual report · FIPS 06091
2018 Sierra County, CA Power Outage Report
In 2018, customers in Sierra County, CA went without power for an average of 7.3 hours, a total of 15K customer-hours (California average 3.7 hours). That ranks 11th worst of 57 California counties and 745th 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 Sierra 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 | September 20, 2018 21:45 | September 21, 2018 01:00 | 3h 15m | 1,676 | 5,168 |
| 2 | December 13, 2018 14:45 | December 14, 2018 01:30 | 10h 45m | 589 | 428 |
| 3 | October 24, 2018 12:45 | October 24, 2018 13:00 | 15m | 554 | 139 |
| 4 | December 6, 2018 12:00 | December 9, 2018 03:00 | 2d 15h | 554 | 3,654 |
| 5 | November 26, 2018 14:00 | November 26, 2018 15:00 | 1h | 520 | 520 |
| 6 | August 23, 2018 16:00 | August 23, 2018 22:45 | 6h 45m | 344 | 1,928 |
| 7 | June 13, 2018 19:45 | June 13, 2018 22:15 | 2h 30m | 206 | 446 |
| 8 | December 20, 2018 17:15 | December 20, 2018 20:15 | 3h | 206 | 567 |
| 9 | December 29, 2018 17:30 | December 29, 2018 21:45 | 4h 15m | 206 | 876 |
| 10 | September 3, 2018 19:30 | September 3, 2018 23:00 | 3h 30m | 86 | 238 |
Outage episodes by size in 2018: 9 reached 100+ customers, 1 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 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 |
| Liberty Utilities | 2018 | 4.8 hrs | 2.19 | 4.8 hrs | 2.19 |
| 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 91% of California's customers in 2018; 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, 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/sierra-county