County annual report · FIPS 30061
2025 Mineral County, MT Power Outage Report
In 2025, customers in Mineral County, MT went without power for an average of 82.3 hours, a total of 202K customer-hours (Montana average 6.8 hours). That ranks 1st worst of 51 Montana counties and 41st 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 Mineral 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 14:15 | December 24, 2025 16:15 | 7d 2h | 5,763 | 168K |
| 2 | May 7, 2025 23:45 | May 8, 2025 14:45 | 15h | 2,463 | 12K |
| 3 | January 4, 2025 01:30 | January 5, 2025 02:15 | 1d | 2,108 | 9,392 |
| 4 | July 9, 2025 20:15 | July 10, 2025 03:00 | 6h 45m | 2,107 | 4,087 |
| 5 | October 25, 2025 06:45 | October 25, 2025 11:00 | 4h 15m | 1,678 | 4,037 |
| 6 | April 26, 2025 00:15 | April 26, 2025 05:00 | 4h 45m | 357 | 1,428 |
| 7 | December 24, 2025 18:45 | December 24, 2025 19:00 | 15m | 357 | 89 |
| 8 | May 29, 2025 16:15 | May 29, 2025 17:30 | 1h 15m | 339 | 424 |
| 9 | May 8, 2025 16:15 | May 8, 2025 19:45 | 3h 30m | 138 | 212 |
| 10 | June 26, 2025 22:15 | June 26, 2025 23:15 | 1h | 138 | 114 |
Outage episodes by size in 2025: 10 reached 100+ customers, 5 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 Mineral 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 |
| Bonneville Power Administration | - | - | - | - | - |
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 ÷ 2,455 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. Mineral County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Mineral 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/mineral-county