County annual report · FIPS 30001
2021 Beaverhead County, MT Power Outage Report
In 2021, customers in Beaverhead County, MT went without power for an average of 2.4 hours, a total of 8,801 customer-hours (Montana average 5.0 hours). That ranks 33rd worst of 51 Montana counties and 2059th of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Beaverhead 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 | April 28, 2021 21:30 | April 28, 2021 21:45 | 15m | 856 | 214 |
| 2 | April 28, 2021 14:45 | April 28, 2021 19:00 | 4h 15m | 698 | 2,024 |
| 3 | April 26, 2021 00:15 | April 26, 2021 03:00 | 2h 45m | 697 | 1,743 |
| 4 | January 15, 2021 19:00 | January 15, 2021 23:00 | 4h | 428 | 1,691 |
| 5 | May 23, 2021 15:15 | May 23, 2021 19:00 | 3h 45m | 409 | 1,277 |
| 6 | June 20, 2021 19:15 | June 20, 2021 21:45 | 2h 30m | 175 | 350 |
| 7 | July 4, 2021 01:15 | July 7, 2021 00:30 | 2d 23h | 106 | 791 |
| 8 | May 18, 2021 22:45 | May 19, 2021 04:00 | 5h 15m | 56 | 267 |
| 9 | January 26, 2021 20:30 | January 26, 2021 23:45 | 3h 15m | 14 | 46 |
| 10 | January 25, 2021 14:30 | January 25, 2021 19:00 | 4h 30m | 11 | 50 |
Outage episodes by size in 2021: 7 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 Beaverhead 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 |
| NorthWestern Energy | - | - | - | - | - |
| Vigilante 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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 3,612 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. Beaverhead County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Beaverhead County, MT 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/montana/beaverhead-county