County annual report · FIPS 30077
2025 Powell County, MT Power Outage Report
In 2025, customers in Powell County, MT went without power for an average of 8.8 hours, a total of 40K customer-hours (Montana average 6.8 hours). That ranks 19th worst of 51 Montana counties and 920th 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 Powell 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 | July 23, 2025 15:45 | July 23, 2025 21:00 | 5h 15m | 1,450 | 2,173 |
| 2 | September 10, 2025 05:30 | September 10, 2025 07:45 | 2h 15m | 1,443 | 3,247 |
| 3 | December 17, 2025 15:45 | December 24, 2025 08:15 | 6d 16h | 689 | 19K |
| 4 | July 5, 2025 00:15 | July 5, 2025 05:45 | 5h 30m | 667 | 3,020 |
| 5 | April 7, 2025 14:30 | April 8, 2025 00:15 | 9h 45m | 460 | 692 |
| 6 | April 11, 2025 22:45 | April 12, 2025 01:15 | 2h 30m | 448 | 762 |
| 7 | August 6, 2025 15:30 | August 6, 2025 23:00 | 7h 30m | 219 | 1,538 |
| 8 | August 28, 2025 16:30 | August 28, 2025 17:00 | 30m | 149 | 69 |
| 9 | June 24, 2025 16:30 | June 26, 2025 00:45 | 1d 8h | 148 | 1,488 |
| 10 | December 10, 2025 18:00 | December 10, 2025 20:15 | 2h 15m | 148 | 333 |
Outage episodes by size in 2025: 11 reached 100+ customers, 2 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 Powell 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 | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
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 ÷ 4,506 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. Powell County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Powell 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/powell-county