County annual report · FIPS 06051
2021 Mono County, CA Power Outage Report
In 2021, customers in Mono County, CA went without power for an average of 36.4 hours, a total of 202K customer-hours (California average 6.6 hours). That ranks 10th worst of 57 California counties and 248th 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 Mono 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 | June 29, 2021 06:15 | June 29, 2021 11:15 | 5h | 24,313 | 22K |
| 2 | September 19, 2021 12:00 | September 19, 2021 18:30 | 6h 30m | 2,679 | 15K |
| 3 | June 1, 2021 15:30 | June 2, 2021 10:15 | 18h 45m | 2,667 | 19K |
| 4 | June 15, 2021 16:45 | June 15, 2021 18:45 | 2h | 1,816 | 1,366 |
| 5 | June 15, 2021 21:00 | June 15, 2021 21:15 | 15m | 1,815 | 454 |
| 6 | June 30, 2021 23:30 | July 1, 2021 11:30 | 12h | 1,778 | 2,998 |
| 7 | February 3, 2021 12:45 | February 3, 2021 20:30 | 7h 45m | 1,435 | 9,413 |
| 8 | August 31, 2021 00:00 | August 31, 2021 20:45 | 20h 45m | 1,306 | 5,327 |
| 9 | September 14, 2021 20:15 | September 14, 2021 21:30 | 1h 15m | 1,259 | 1,196 |
| 10 | December 14, 2021 08:45 | December 18, 2021 23:00 | 4d 14h | 1,156 | 11K |
Outage episodes by size in 2021: 60 reached 100+ customers, 11 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 Mono 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 |
|---|---|---|---|---|---|
| Southern California Edison Co | 2021 | 3.0 hrs | 1.11 | 1.7 hrs | 0.96 |
| Liberty Utilities | 2021 | 16.8 hrs | 4.60 | 11.7 hrs | 3.86 |
| Valley Electric Assn, Inc | 2021 | 87 min | 0.77 | 34 min | 0.47 |
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 ÷ 5,551 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. Mono County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Mono 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/mono-county