County annual report · FIPS 30013
2025 Cascade County, MT Power Outage Report
In 2025, customers in Cascade County, MT went without power for an average of 4.1 hours, a total of 161K customer-hours (Montana average 6.8 hours). That ranks 32nd worst of 51 Montana counties and 1740th 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 Cascade 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 14:00 | December 30, 2025 00:15 | 12d 10h | 3,633 | 13K |
| 2 | March 10, 2025 15:00 | March 10, 2025 21:15 | 6h 15m | 3,442 | 8,630 |
| 3 | May 5, 2025 03:30 | May 6, 2025 06:00 | 1d 2h | 2,346 | 22K |
| 4 | April 1, 2025 14:15 | April 2, 2025 05:45 | 15h 30m | 2,022 | 6,019 |
| 5 | December 16, 2025 10:45 | December 17, 2025 05:00 | 18h 15m | 1,632 | 7,682 |
| 6 | July 15, 2025 10:45 | July 15, 2025 23:45 | 13h | 1,573 | 7,131 |
| 7 | May 29, 2025 05:15 | May 29, 2025 11:00 | 5h 45m | 1,319 | 7,584 |
| 8 | November 7, 2025 18:15 | November 7, 2025 20:30 | 2h 15m | 1,223 | 376 |
| 9 | March 22, 2025 01:45 | March 22, 2025 12:45 | 11h | 1,103 | 1,987 |
| 10 | May 6, 2025 14:45 | May 6, 2025 23:45 | 9h | 971 | 1,247 |
Outage episodes by size in 2025: 54 reached 100+ customers, 9 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 Cascade 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 | - | - | - | - | - |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Sun River 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 ÷ 39,166 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. Cascade County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Cascade 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/cascade-county