County annual report · FIPS 30099
2025 Teton County, MT Power Outage Report
In 2025, customers in Teton County, MT went without power for an average of 4.2 hours, a total of 8,646 customer-hours (Montana average 6.8 hours). That ranks 30th worst of 51 Montana counties and 1709th of 3,000 nationally.
Compared with MT, the US and 2024
Coverage line is EAGLE-I's share of Montana 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 | December 17, 2025 21:15 | December 19, 2025 22:15 | 2d 1h | 1,216 | 4,089 |
| 2 | April 1, 2025 16:30 | April 2, 2025 04:45 | 12h 15m | 383 | 1,267 |
| 3 | February 27, 2025 19:00 | February 27, 2025 21:15 | 2h 15m | 364 | 728 |
| 4 | July 8, 2025 14:15 | July 8, 2025 17:00 | 2h 45m | 129 | 355 |
| 5 | January 23, 2025 21:45 | January 23, 2025 22:45 | 1h | 105 | 105 |
| 6 | February 11, 2025 06:00 | February 11, 2025 07:00 | 1h | 104 | 104 |
| 7 | March 26, 2025 18:15 | March 26, 2025 19:15 | 1h | 104 | 104 |
| 8 | July 3, 2025 02:45 | July 3, 2025 08:30 | 5h 45m | 104 | 137 |
| 9 | August 5, 2025 01:15 | August 5, 2025 02:15 | 1h | 74 | 74 |
| 10 | February 22, 2025 14:15 | February 22, 2025 17:15 | 3h | 63 | 189 |
Outage episodes by size in 2025: 8 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Sun River Electric Coop, 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 Montana's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,050 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 2020–2025.
Cite this report
MassOutage (massoutage.com), Teton County, MT 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/montana/teton-county