County annual report · FIPS 56039
2019 Teton County, WY Power Outage Report
In 2019, customers in Teton County, WY went without power for an average of 0.6 hours, a total of 11K customer-hours (Wyoming average 1.3 hours). That ranks 19th worst of 22 Wyoming counties and 2650th of 2,945 nationally.
Compared with WY, the US and 2018
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Teton 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 | April 26, 2019 18:30 | April 26, 2019 19:45 | 1h 15m | 1,177 | 295 |
| 2 | February 10, 2019 06:30 | February 10, 2019 18:30 | 12h | 519 | 1,523 |
| 3 | August 11, 2019 19:15 | August 11, 2019 19:30 | 15m | 394 | 99 |
| 4 | November 2, 2019 05:00 | November 2, 2019 10:15 | 5h 15m | 327 | 1,717 |
| 5 | July 9, 2019 12:45 | July 9, 2019 16:30 | 3h 45m | 231 | 681 |
| 6 | May 22, 2019 14:00 | May 22, 2019 20:45 | 6h 45m | 198 | 411 |
| 7 | April 12, 2019 16:15 | April 12, 2019 16:30 | 15m | 189 | 47 |
| 8 | May 12, 2019 11:45 | May 12, 2019 13:15 | 1h 30m | 189 | 284 |
| 9 | July 28, 2019 21:45 | July 28, 2019 22:15 | 30m | 189 | 48 |
| 10 | November 30, 2019 12:15 | November 30, 2019 15:30 | 3h 15m | 185 | 107 |
Outage episodes by size in 2019: 20 reached 100+ customers, 1 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 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 |
|---|---|---|---|---|---|
| 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 68% of Wyoming's customers in 2019; 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, 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/wyoming/teton-county