County annual report · FIPS 30065
2021 Musselshell County, MT Power Outage Report
In 2021, customers in Musselshell County, MT went without power for an average of 1.5 hours, a total of 3,553 customer-hours (Montana average 5.0 hours). That ranks 43rd worst of 51 Montana counties and 2465th 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 Musselshell 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 | November 13, 2021 18:45 | November 14, 2021 03:00 | 8h 15m | 105 | 677 |
| 2 | January 13, 2021 23:00 | January 15, 2021 04:15 | 1d 5h | 98 | 980 |
| 3 | December 23, 2021 12:15 | December 23, 2021 18:15 | 6h | 89 | 463 |
| 4 | December 28, 2021 01:30 | December 28, 2021 03:30 | 2h | 62 | 122 |
| 5 | January 13, 2021 20:45 | January 13, 2021 22:15 | 1h 30m | 36 | 37 |
| 6 | May 8, 2021 11:00 | May 8, 2021 13:15 | 2h 15m | 34 | 42 |
| 7 | June 10, 2021 22:45 | June 10, 2021 23:15 | 30m | 33 | 9 |
| 8 | November 2, 2021 10:00 | November 2, 2021 12:00 | 2h | 31 | 47 |
| 9 | February 5, 2021 21:00 | February 5, 2021 22:00 | 1h | 29 | 29 |
| 10 | June 12, 2021 02:45 | June 12, 2021 04:30 | 1h 45m | 28 | 48 |
Outage episodes by size in 2021: 1 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 Musselshell 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 |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Yellowstone Valley Elec Co-op | - | - | - | - | - |
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 ÷ 2,362 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. Musselshell County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Musselshell 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/musselshell-county