County annual report · FIPS 56039
2020 Teton County, WY Power Outage Report
In 2020, customers in Teton County, WY went without power for an average of 0.1 hours, a total of 1,798 customer-hours (Wyoming average 3.4 hours). That ranks 21st worst of 22 Wyoming counties and 2945th of 3,019 nationally.
Compared with WY, the US and 2019
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Teton 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 | May 28, 2020 14:15 | May 28, 2020 20:30 | 6h 15m | 297 | 244 |
| 2 | January 24, 2020 06:00 | January 24, 2020 09:00 | 3h | 295 | 512 |
| 3 | May 25, 2020 18:00 | May 25, 2020 18:45 | 45m | 220 | 60 |
| 4 | January 1, 2020 12:00 | January 1, 2020 18:30 | 6h 30m | 125 | 193 |
| 5 | January 6, 2020 11:30 | January 6, 2020 13:45 | 2h 15m | 86 | 105 |
| 6 | May 21, 2020 16:15 | May 21, 2020 22:30 | 6h 15m | 80 | 123 |
| 7 | May 27, 2020 20:30 | May 27, 2020 21:45 | 1h 15m | 31 | 19 |
| 8 | April 20, 2020 18:00 | April 20, 2020 20:00 | 2h | 24 | 19 |
| 9 | April 29, 2020 14:00 | April 29, 2020 22:15 | 8h 15m | 24 | 117 |
| 10 | March 15, 2020 15:15 | March 15, 2020 17:00 | 1h 45m | 20 | 13 |
Outage episodes by size in 2020: 4 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 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| Fall River Rural Elec Coop Inc | 2020 | 70 min | 0.56 | 56 min | 0.47 |
| 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 71% of Wyoming's customers in 2020; 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, 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/wyoming/teton-county