County annual report · FIPS 30099
2023 Teton County, MT Power Outage Report
In 2023, customers in Teton County, MT went without power for an average of 4.4 hours, a total of 9,086 customer-hours (Montana average 1.8 hours). That ranks 12th worst of 50 Montana counties and 1583rd of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Teton County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 13, 2023 10:45 | July 13, 2023 12:30 | 1h 45m | 918 | 1,378 |
| 2 | April 19, 2023 11:45 | April 19, 2023 22:15 | 10h 30m | 481 | 1,169 |
| 3 | January 17, 2023 03:15 | January 17, 2023 05:15 | 2h | 353 | 596 |
| 4 | August 12, 2023 10:00 | August 12, 2023 12:30 | 2h 30m | 343 | 858 |
| 5 | July 25, 2023 11:00 | July 25, 2023 13:45 | 2h 45m | 327 | 899 |
| 6 | August 22, 2023 00:30 | August 22, 2023 04:30 | 4h | 327 | 1,308 |
| 7 | August 21, 2023 15:15 | August 21, 2023 18:15 | 3h | 265 | 386 |
| 8 | May 18, 2023 15:15 | May 18, 2023 20:45 | 5h 30m | 187 | 469 |
| 9 | January 27, 2023 19:15 | January 27, 2023 21:00 | 1h 45m | 129 | 226 |
| 10 | May 17, 2023 15:15 | May 17, 2023 18:45 | 3h 30m | 69 | 242 |
Outage episodes by size in 2023: 9 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| 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 2023; 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, 2023, 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/2023/montana/teton-county