County annual report · FIPS 30099
2020 Teton County, MT Power Outage Report
In 2020, customers in Teton County, MT went without power for an average of 22.9 hours, a total of 47K customer-hours (Montana average 5.6 hours). That ranks 3rd worst of 50 Montana counties and 374th of 3,019 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana 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 | February 3, 2020 20:45 | February 4, 2020 11:45 | 15h | 1,429 | 4,004 |
| 2 | February 19, 2020 22:30 | February 20, 2020 00:15 | 1h 45m | 1,251 | 1,321 |
| 3 | February 1, 2020 12:30 | February 3, 2020 19:30 | 2d 7h | 940 | 4,896 |
| 4 | September 24, 2020 23:00 | September 25, 2020 06:00 | 7h | 928 | 273 |
| 5 | June 1, 2020 20:45 | June 2, 2020 00:15 | 3h 30m | 595 | 616 |
| 6 | August 31, 2020 21:00 | August 31, 2020 22:15 | 1h 15m | 595 | 744 |
| 7 | March 11, 2020 09:45 | March 15, 2020 01:00 | 3d 15h | 578 | 1,182 |
| 8 | September 18, 2020 18:30 | September 18, 2020 19:45 | 1h 15m | 536 | 670 |
| 9 | May 11, 2020 19:00 | May 12, 2020 00:30 | 5h 30m | 534 | 821 |
| 10 | April 30, 2020 14:15 | April 30, 2020 23:30 | 9h 15m | 533 | 998 |
Outage episodes by size in 2020: 33 reached 100+ customers, 2 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 |
| 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 76% of Montana's customers in 2020; 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, 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/montana/teton-county