County annual report · FIPS 56039
2018 Teton County, WY Power Outage Report
In 2018, customers in Teton County, WY went without power for an average of 0.1 hours, a total of 1,087 customer-hours (Wyoming average 1.2 hours). That ranks 18th worst of 21 Wyoming counties and 2685th of 2,798 nationally.
Compared with WY, the US
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Teton 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 | March 23, 2018 19:15 | March 23, 2018 22:00 | 2h 45m | 293 | 687 |
| 2 | October 22, 2018 15:30 | October 22, 2018 16:15 | 45m | 56 | 28 |
| 3 | September 30, 2018 20:45 | September 30, 2018 22:45 | 2h | 54 | 108 |
| 4 | September 21, 2018 14:30 | September 21, 2018 15:15 | 45m | 50 | 38 |
| 5 | September 20, 2018 19:30 | September 20, 2018 21:30 | 2h | 31 | 62 |
| 6 | December 10, 2018 18:00 | December 10, 2018 18:30 | 30m | 24 | 12 |
| 7 | July 17, 2018 02:00 | July 17, 2018 02:30 | 30m | 23 | 12 |
| 8 | March 4, 2018 10:15 | March 4, 2018 11:45 | 1h 30m | 22 | 17 |
| 9 | July 14, 2018 14:00 | July 14, 2018 15:00 | 1h | 20 | 15 |
| 10 | June 4, 2018 01:45 | June 4, 2018 02:00 | 15m | 9 | 2 |
Outage episodes by size in 2018: 1 reached 100+ customers, 0 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 Teton 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2018 | 1.7 hrs | 1.08 | 1.7 hrs | 1.08 |
| Fall River Rural Elec Coop Inc | 2018 | 4.6 hrs | 2.31 | 4.2 hrs | 2.11 |
| High Plains Power Inc | - | - | - | - | - |
| Lower Valley Energy Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 62% of Wyoming's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 18,592 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. Teton County has data for 2018–2025.
Cite this report
MassOutage (massoutage.com), Teton County, WY 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/wyoming/teton-county