County annual report · FIPS 06109
2019 Tuolumne County, CA Power Outage Report
In 2019, customers in Tuolumne County, CA went without power for an average of 145.1 hours, a total of 3.4M customer-hours (California average 9.6 hours). That ranks 5th worst of 57 California counties and 19th of 2,945 nationally.
Compared with CA, the US and 2018
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Tuolumne County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 10, 2019 02:30 | October 10, 2019 03:00 | 30m | 37,533 | 18K |
| 2 | October 9, 2019 22:30 | October 10, 2019 01:30 | 3h | 36,209 | 77K |
| 3 | October 27, 2019 07:15 | October 29, 2019 08:00 | 2d | 35,729 | 1.3M |
| 4 | October 10, 2019 19:15 | October 10, 2019 19:30 | 15m | 34,541 | 8,635 |
| 5 | October 10, 2019 05:30 | October 10, 2019 16:00 | 10h 30m | 34,540 | 352K |
| 6 | October 10, 2019 20:15 | October 12, 2019 19:15 | 1d 23h | 34,124 | 545K |
| 7 | February 4, 2019 15:30 | February 9, 2019 21:15 | 5d 5h | 27,411 | 491K |
| 8 | February 2, 2019 13:00 | February 4, 2019 05:30 | 1d 16h | 17,075 | 11K |
| 9 | October 29, 2019 10:45 | October 31, 2019 12:15 | 2d 1h | 9,676 | 240K |
| 10 | October 29, 2019 09:15 | October 29, 2019 10:00 | 45m | 8,605 | 6,454 |
Outage episodes by size in 2019: 122 reached 100+ customers, 40 reached 1,000+ customers, 8 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 2019, 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 |
| Southern California Edison Co | 2018 | 2.3 hrs | 0.87 | 71 min | 0.72 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Turlock Irrigation District | - | - | - | - | - |
| 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 93% of California's customers in 2019; 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, 2019, 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/2019/california/tuolumne-county