County annual report · FIPS 06109
2022 Tuolumne County, CA Power Outage Report
In 2022, customers in Tuolumne County, CA went without power for an average of 22.2 hours, a total of 523K customer-hours (California average 4.9 hours). That ranks 11th worst of 57 California counties and 288th of 2,976 nationally.
Compared with CA, the US and 2021
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Tuolumne County, 2022
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 10, 2022 16:15 | December 13, 2022 10:15 | 2d 18h | 9,270 | 63K |
| 2 | July 12, 2022 01:45 | July 12, 2022 10:45 | 9h | 7,711 | 24K |
| 3 | August 5, 2022 11:45 | August 6, 2022 08:00 | 20h 15m | 4,489 | 30K |
| 4 | November 13, 2022 14:45 | November 14, 2022 08:00 | 17h 15m | 4,450 | 20K |
| 5 | August 6, 2022 15:00 | August 7, 2022 22:45 | 1d 7h | 4,440 | 20K |
| 6 | July 26, 2022 13:00 | July 27, 2022 00:00 | 11h | 3,595 | 6,591 |
| 7 | June 24, 2022 12:45 | June 25, 2022 00:45 | 12h | 3,077 | 14K |
| 8 | August 3, 2022 15:45 | August 5, 2022 00:30 | 1d 8h | 3,026 | 6,383 |
| 9 | November 1, 2022 15:45 | November 2, 2022 23:30 | 1d 7h | 2,971 | 15K |
| 10 | March 3, 2022 16:15 | March 3, 2022 23:45 | 7h 30m | 2,904 | 1,738 |
Outage episodes by size in 2022: 99 reached 100+ customers, 34 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 Tuolumne County reported on EIA Form 861 for 2022, 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. | 2022 | 5.4 hrs | 1.78 | 4.3 hrs | 1.63 |
| Southern California Edison Co | 2022 | 2.2 hrs | 1.08 | 1.7 hrs | 0.96 |
| Turlock Irrigation District | 2022 | 1.6 hrs | 0.58 | 68 min | 0.50 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Tuolumne County Pub Power Agny | - | - | - | - | - |
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 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 23,610 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. Tuolumne County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Tuolumne County, CA annual power outage report, 2022, 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/2022/california/tuolumne-county