County annual report · FIPS 30065
2025 Musselshell County, MT Power Outage Report
In 2025, customers in Musselshell County, MT went without power for an average of 8.1 hours, a total of 19K customer-hours (Montana average 6.8 hours). That ranks 23rd worst of 51 Montana counties and 999th 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 Musselshell 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 | November 30, 2025 03:30 | November 30, 2025 09:00 | 5h 30m | 574 | 1,864 |
| 2 | August 19, 2025 05:00 | August 19, 2025 07:45 | 2h 45m | 541 | 1,488 |
| 3 | September 5, 2025 05:00 | September 5, 2025 10:15 | 5h 15m | 541 | 2,104 |
| 4 | July 29, 2025 01:15 | July 29, 2025 12:15 | 11h | 528 | 3,147 |
| 5 | July 15, 2025 04:45 | July 15, 2025 09:45 | 5h | 486 | 1,676 |
| 6 | August 18, 2025 01:00 | August 18, 2025 12:45 | 11h 45m | 454 | 4,510 |
| 7 | February 22, 2025 18:00 | February 22, 2025 21:00 | 3h | 121 | 353 |
| 8 | December 9, 2025 14:45 | December 9, 2025 19:15 | 4h 30m | 92 | 213 |
| 9 | October 29, 2025 15:30 | October 29, 2025 22:30 | 7h | 87 | 480 |
| 10 | July 5, 2025 09:45 | July 5, 2025 11:45 | 2h | 85 | 170 |
Outage episodes by size in 2025: 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 Musselshell 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 |
| 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 n/a of Montana's customers in 2025; 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, 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/musselshell-county