County annual report · FIPS 06051
2025 Mono County, CA Power Outage Report
In 2025, customers in Mono County, CA went without power for an average of 107.1 hours, a total of 594K customer-hours (California average 7.6 hours). That ranks 1st worst of 57 California counties and 27th of 3,000 nationally.
Compared with CA, the US and 2024
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Mono County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 21, 2025 15:00 | August 22, 2025 01:15 | 10h 15m | 13,752 | 28K |
| 2 | March 24, 2025 05:45 | March 24, 2025 10:30 | 4h 45m | 11,699 | 56K |
| 3 | August 30, 2025 04:45 | August 31, 2025 07:00 | 1d 2h | 9,171 | 94K |
| 4 | June 12, 2025 14:30 | June 12, 2025 22:45 | 8h 15m | 4,801 | 8,132 |
| 5 | August 22, 2025 22:45 | August 23, 2025 15:00 | 16h 15m | 3,958 | 35K |
| 6 | September 3, 2025 16:15 | September 4, 2025 01:15 | 9h | 3,670 | 17K |
| 7 | September 17, 2025 17:30 | September 18, 2025 00:00 | 6h 30m | 2,665 | 4,736 |
| 8 | August 22, 2025 03:30 | August 22, 2025 11:30 | 8h | 2,233 | 2,246 |
| 9 | October 8, 2025 18:30 | October 14, 2025 07:15 | 5d 12h | 1,943 | 24K |
| 10 | June 10, 2025 13:45 | June 10, 2025 14:30 | 45m | 1,831 | 1,373 |
Outage episodes by size in 2025: 96 reached 100+ customers, 22 reached 1,000+ customers, 2 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 2025, 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 | 2024 | 2.6 hrs | 0.99 | 1.7 hrs | 0.90 |
| Liberty Utilities | 2024 | 12.4 hrs | 2.57 | 8.3 hrs | 2.37 |
| Valley Electric Assn, Inc | 2024 | 85 min | 1.07 | 44 min | 0.69 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of California's customers in 2025; 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, 2025, 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/2025/california/mono-county