County annual report · FIPS 56039
2025 Teton County, WY Power Outage Report
In 2025, customers in Teton County, WY went without power for an average of 1.8 hours, a total of 34K customer-hours (Wyoming average 3.8 hours). That ranks 16th worst of 20 Wyoming counties and 2481st of 3,000 nationally.
Compared with WY, the US and 2024
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Teton County, 2025
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 27, 2025 14:30 | October 27, 2025 19:30 | 5h | 1,534 | 5,028 |
| 2 | August 26, 2025 15:00 | August 26, 2025 15:45 | 45m | 870 | 247 |
| 3 | January 26, 2025 15:45 | January 27, 2025 00:30 | 8h 45m | 551 | 2,201 |
| 4 | July 2, 2025 23:30 | July 3, 2025 02:30 | 3h | 476 | 1,039 |
| 5 | March 22, 2025 14:00 | March 22, 2025 16:15 | 2h 15m | 464 | 682 |
| 6 | September 11, 2025 04:15 | September 11, 2025 06:00 | 1h 45m | 426 | 746 |
| 7 | September 24, 2025 21:00 | September 24, 2025 21:30 | 30m | 346 | 109 |
| 8 | June 20, 2025 03:00 | June 23, 2025 22:00 | 3d 19h | 319 | 4,284 |
| 9 | November 7, 2025 03:30 | November 7, 2025 05:45 | 2h 15m | 270 | 608 |
| 10 | September 10, 2025 05:30 | September 10, 2025 10:15 | 4h 45m | 220 | 1,009 |
Outage episodes by size in 2025: 23 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 2025, 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) | 2024 | 3.9 hrs | 1.30 | 2.0 hrs | 0.95 |
| High Plains Power Inc | 2024 | 5.2 hrs | - | 5.2 hrs | - |
| Fall River Rural Elec Coop Inc | 2024 | 14 min | 0.11 | 10 min | 0.08 |
| 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 n/a of Wyoming's customers in 2025; 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, 2025, 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/2025/wyoming/teton-county