County annual report · FIPS 30105
2025 Valley County, MT Power Outage Report
In 2025, customers in Valley County, MT went without power for an average of 13.6 hours, a total of 53K customer-hours (Montana average 6.8 hours). That ranks 12th worst of 51 Montana counties and 563rd 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 Valley 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 | January 24, 2025 21:00 | January 24, 2025 22:30 | 1h 30m | 3,214 | 3,806 |
| 2 | December 26, 2025 17:45 | December 26, 2025 20:45 | 3h | 3,145 | 5,559 |
| 3 | December 23, 2025 09:15 | December 23, 2025 12:15 | 3h | 2,687 | 8,061 |
| 4 | August 1, 2025 04:15 | August 1, 2025 07:30 | 3h 15m | 2,373 | 5,497 |
| 5 | December 17, 2025 19:45 | December 20, 2025 00:30 | 2d 4h | 800 | 12K |
| 6 | June 16, 2025 02:00 | June 16, 2025 07:30 | 5h 30m | 796 | 2,218 |
| 7 | August 8, 2025 00:00 | August 8, 2025 03:30 | 3h 30m | 590 | 1,979 |
| 8 | May 18, 2025 06:30 | May 18, 2025 10:45 | 4h 15m | 493 | 1,027 |
| 9 | May 11, 2025 04:30 | May 11, 2025 06:30 | 2h | 473 | 132 |
| 10 | December 11, 2025 15:15 | December 12, 2025 02:00 | 10h 45m | 370 | 1,443 |
Outage episodes by size in 2025: 21 reached 100+ customers, 4 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 Valley 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| NorVal Electric Cooperative, Inc | - | - | - | - | - |
| Big Flat 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 n/a of Montana's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 3,912 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. Valley County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Valley 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/valley-county