County annual report · FIPS 30063
2025 Missoula County, MT Power Outage Report
In 2025, customers in Missoula County, MT went without power for an average of 7.3 hours, a total of 419K customer-hours (Montana average 6.8 hours). That ranks 25th worst of 51 Montana counties and 1097th 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 Missoula 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 | December 10, 2025 14:15 | December 24, 2025 00:45 | 13d 10h | 8,400 | 267K |
| 2 | December 4, 2025 22:45 | December 8, 2025 22:30 | 3d 23h | 3,560 | 15K |
| 3 | March 31, 2025 15:30 | March 31, 2025 16:45 | 1h 15m | 2,869 | 3,586 |
| 4 | October 17, 2025 05:15 | October 17, 2025 13:00 | 7h 45m | 2,859 | 22K |
| 5 | July 9, 2025 20:45 | July 9, 2025 23:30 | 2h 45m | 2,758 | 1,487 |
| 6 | June 19, 2025 06:15 | June 19, 2025 11:45 | 5h 30m | 2,717 | 14K |
| 7 | August 9, 2025 15:30 | August 9, 2025 17:15 | 1h 45m | 2,440 | 2,440 |
| 8 | May 3, 2025 16:30 | May 4, 2025 06:45 | 14h 15m | 2,047 | 5,641 |
| 9 | April 24, 2025 22:30 | April 25, 2025 13:45 | 15h 15m | 1,602 | 4,290 |
| 10 | August 30, 2025 16:30 | August 30, 2025 21:30 | 5h | 1,581 | 1,057 |
Outage episodes by size in 2025: 69 reached 100+ customers, 12 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 Missoula 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 |
| Missoula Electric Coop, Inc | 2024 | 26.8 hrs | 3.59 | 8.4 hrs | 2.19 |
| Ravalli County Elec Coop, Inc | 2018 | 4.2 hrs | 1.53 | 2.5 hrs | 1.41 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| USBIA-Mission Valley Power | - | - | - | - | - |
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 ÷ 57,348 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. Missoula County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Missoula 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/missoula-county