County annual report · FIPS 06109
2023 Tuolumne County, CA Power Outage Report
In 2023, customers in Tuolumne County, CA went without power for an average of 88.5 hours, a total of 2.1M customer-hours (California average 7.9 hours). That ranks 5th worst of 57 California counties and 34th of 2,977 nationally.
Compared with CA, the US and 2022
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Tuolumne County, 2023
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 9, 2023 22:15 | September 17, 2023 06:30 | 7d 8h | 37,050 | 631K |
| 2 | February 27, 2023 15:45 | April 2, 2023 05:15 | 33d 13h | 10,969 | 636K |
| 3 | January 10, 2023 12:45 | January 10, 2023 19:00 | 6h 15m | 7,972 | 39K |
| 4 | February 24, 2023 12:00 | February 25, 2023 03:00 | 15h | 7,818 | 10K |
| 5 | January 7, 2023 21:45 | January 10, 2023 01:00 | 2d 3h | 6,692 | 112K |
| 6 | July 1, 2023 14:00 | July 3, 2023 00:15 | 1d 10h | 6,665 | 98K |
| 7 | July 3, 2023 01:30 | July 4, 2023 03:00 | 1d 1h | 6,186 | 75K |
| 8 | August 18, 2023 14:00 | August 20, 2023 05:45 | 1d 15h | 5,593 | 13K |
| 9 | October 23, 2023 04:15 | October 23, 2023 11:30 | 7h 15m | 4,295 | 12K |
| 10 | October 14, 2023 08:30 | October 14, 2023 20:45 | 12h 15m | 4,256 | 32K |
Outage episodes by size in 2023: 125 reached 100+ customers, 46 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 Tuolumne County reported on EIA Form 861 for 2023, 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. | 2023 | 11.9 hrs | 2.22 | 4.3 hrs | 1.56 |
| Southern California Edison Co | 2023 | 1.9 hrs | 1.04 | 1.6 hrs | 0.94 |
| Turlock Irrigation District | 2023 | 80 min | 0.74 | 61 min | 0.63 |
| 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 n/a of California's customers in 2023; 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, 2023, 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/2023/california/tuolumne-county