County annual report · FIPS 06109
2020 Tuolumne County, CA Power Outage Report
In 2020, customers in Tuolumne County, CA went without power for an average of 98.2 hours, a total of 2.3M customer-hours (California average 6.3 hours). That ranks 2nd worst of 57 California counties and 67th of 3,019 nationally.
Compared with CA, the US and 2019
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Tuolumne County, 2020
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 8, 2020 06:15 | September 10, 2020 04:00 | 1d 21h | 30,341 | 883K |
| 2 | October 25, 2020 19:30 | October 28, 2020 01:30 | 2d 6h | 28,593 | 752K |
| 3 | July 29, 2020 14:15 | July 30, 2020 07:30 | 17h 15m | 12,104 | 29K |
| 4 | February 9, 2020 17:30 | February 11, 2020 05:30 | 1d 12h | 5,941 | 19K |
| 5 | March 15, 2020 18:00 | March 20, 2020 03:30 | 4d 9h | 4,454 | 140K |
| 6 | November 14, 2020 01:00 | November 14, 2020 09:00 | 8h | 4,442 | 2,056 |
| 7 | August 20, 2020 16:00 | August 25, 2020 02:15 | 4d 10h | 4,154 | 285K |
| 8 | November 11, 2020 16:30 | November 11, 2020 21:45 | 5h 15m | 3,840 | 2,428 |
| 9 | February 11, 2020 17:00 | February 11, 2020 23:30 | 6h 30m | 3,772 | 1,214 |
| 10 | April 15, 2020 10:00 | April 15, 2020 11:30 | 1h 30m | 2,789 | 3,517 |
Outage episodes by size in 2020: 104 reached 100+ customers, 22 reached 1,000+ customers, 3 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 2020, 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. | 2020 | 7.4 hrs | 1.34 | 2.3 hrs | 1.04 |
| Southern California Edison Co | 2020 | 3.4 hrs | 1.06 | 1.5 hrs | 0.87 |
| Turlock Irrigation District | 2020 | 75 min | 0.66 | 56 min | 0.57 |
| 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 94% of California's customers in 2020; 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, 2020, 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/2020/california/tuolumne-county