County annual report · FIPS 30095
2025 Stillwater County, MT Power Outage Report
In 2025, customers in Stillwater County, MT went without power for an average of 3.3 hours, a total of 18K customer-hours (Montana average 6.8 hours). That ranks 34th worst of 51 Montana counties and 1967th 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 Stillwater 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 17, 2025 19:30 | December 19, 2025 11:45 | 1d 16h | 754 | 6,578 |
| 2 | July 13, 2025 23:45 | July 14, 2025 03:15 | 3h 30m | 604 | 931 |
| 3 | November 16, 2025 07:45 | November 16, 2025 16:00 | 8h 15m | 587 | 4,843 |
| 4 | March 12, 2025 21:30 | March 12, 2025 23:30 | 2h | 507 | 1,014 |
| 5 | August 21, 2025 06:15 | August 21, 2025 09:00 | 2h 45m | 507 | 1,394 |
| 6 | July 18, 2025 13:00 | July 18, 2025 22:30 | 9h 30m | 472 | 533 |
| 7 | July 11, 2025 00:00 | July 11, 2025 06:45 | 6h 45m | 199 | 380 |
| 8 | July 25, 2025 21:15 | July 25, 2025 22:15 | 1h | 85 | 85 |
| 9 | September 16, 2025 14:15 | September 16, 2025 18:00 | 3h 45m | 61 | 66 |
| 10 | May 19, 2025 14:00 | May 19, 2025 16:45 | 2h 45m | 48 | 132 |
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 Stillwater 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 |
| NorthWestern Energy | - | - | - | - | - |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Yellowstone Valley Elec Co-op | - | - | - | - | - |
| Beartooth 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 ÷ 5,383 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. Stillwater County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Stillwater 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/stillwater-county