County annual report · FIPS 30027
2025 Fergus County, MT Power Outage Report
In 2025, customers in Fergus County, MT went without power for an average of 4.4 hours, a total of 24K customer-hours (Montana average 6.8 hours). That ranks 29th worst of 51 Montana counties and 1652nd 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 Fergus 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 | June 25, 2025 17:45 | June 25, 2025 20:15 | 2h 30m | 2,802 | 5,771 |
| 2 | June 27, 2025 03:30 | June 27, 2025 05:00 | 1h 30m | 1,161 | 1,373 |
| 3 | June 27, 2025 07:15 | June 27, 2025 10:45 | 3h 30m | 1,160 | 2,039 |
| 4 | July 30, 2025 05:15 | July 30, 2025 06:00 | 45m | 1,154 | 866 |
| 5 | July 14, 2025 05:15 | July 14, 2025 06:30 | 1h 15m | 714 | 893 |
| 6 | September 16, 2025 19:00 | September 17, 2025 02:15 | 7h 15m | 598 | 1,882 |
| 7 | September 4, 2025 17:15 | September 4, 2025 18:30 | 1h 15m | 460 | 575 |
| 8 | November 3, 2025 02:00 | November 3, 2025 03:45 | 1h 45m | 437 | 765 |
| 9 | June 28, 2025 17:15 | June 28, 2025 21:00 | 3h 45m | 425 | 1,594 |
| 10 | September 16, 2025 16:30 | September 16, 2025 17:45 | 1h 15m | 342 | 428 |
Outage episodes by size in 2025: 16 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 Fergus 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 | - | - | - | - | - |
| Hill County 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 ÷ 5,384 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. Fergus County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Fergus 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/fergus-county