County annual report · FIPS 06109
2018 Tuolumne County, CA Power Outage Report
In 2018, customers in Tuolumne County, CA went without power for an average of 2.9 hours, a total of 69K customer-hours (California average 3.7 hours). That ranks 24th worst of 57 California counties and 1535th of 2,798 nationally.
Compared with CA, the US and 2017
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Tuolumne County, 2018
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 29, 2018 17:15 | September 29, 2018 20:00 | 2h 45m | 4,438 | 2,339 |
| 2 | October 20, 2018 14:15 | October 20, 2018 16:00 | 1h 45m | 2,818 | 3,023 |
| 3 | June 30, 2018 04:00 | June 30, 2018 09:45 | 5h 45m | 2,816 | 1,233 |
| 4 | July 14, 2018 08:45 | July 14, 2018 19:15 | 10h 30m | 1,692 | 5,281 |
| 5 | September 2, 2018 13:00 | September 2, 2018 16:00 | 3h | 1,614 | 3,493 |
| 6 | October 5, 2018 22:45 | October 6, 2018 04:15 | 5h 30m | 1,285 | 2,294 |
| 7 | November 8, 2018 17:15 | November 9, 2018 02:15 | 9h | 1,256 | 2,563 |
| 8 | June 12, 2018 04:00 | June 12, 2018 13:15 | 9h 15m | 863 | 4,758 |
| 9 | November 11, 2018 07:45 | November 11, 2018 19:00 | 11h 15m | 824 | 935 |
| 10 | August 14, 2018 22:30 | August 15, 2018 03:45 | 5h 15m | 794 | 2,779 |
Outage episodes by size in 2018: 46 reached 100+ customers, 7 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 2018, 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 91% of California's customers in 2018; 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, 2018, 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/2018/california/tuolumne-county