County annual report · FIPS 56039
2021 Teton County, WY Power Outage Report
In 2021, customers in Teton County, WY went without power for an average of 0.0 hours, a total of 763 customer-hours (Wyoming average 2.2 hours). That ranks 20th worst of 20 Wyoming counties and 2939th of 2,974 nationally.
Compared with WY, the US and 2020
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Teton County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 12, 2021 16:30 | October 12, 2021 18:30 | 2h | 106 | 116 |
| 2 | July 12, 2021 23:30 | July 13, 2021 03:45 | 4h 15m | 63 | 253 |
| 3 | August 11, 2021 18:00 | August 11, 2021 19:15 | 1h 15m | 35 | 44 |
| 4 | October 19, 2021 03:00 | October 19, 2021 04:00 | 1h | 35 | 35 |
| 5 | January 23, 2021 19:00 | January 23, 2021 20:30 | 1h 30m | 31 | 43 |
| 6 | June 17, 2021 21:15 | June 17, 2021 22:00 | 45m | 23 | 17 |
| 7 | July 30, 2021 00:00 | July 30, 2021 01:30 | 1h 30m | 23 | 35 |
| 8 | August 24, 2021 17:45 | August 24, 2021 19:00 | 1h 15m | 23 | 23 |
| 9 | November 12, 2021 19:30 | November 12, 2021 22:00 | 2h 30m | 18 | 41 |
| 10 | June 13, 2021 09:00 | June 13, 2021 10:00 | 1h | 15 | 9 |
Outage episodes by size in 2021: 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 2021, 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) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| Fall River Rural Elec Coop Inc | 2021 | 71 min | 0.61 | 57 min | 0.50 |
| 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 2021; 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, 2021, 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/2021/wyoming/teton-county