County annual report · FIPS 30013
2024 Cascade County, MT Power Outage Report
In 2024, customers in Cascade County, MT went without power for an average of 7.5 hours, a total of 293K customer-hours (Montana average 8.5 hours). That ranks 19th worst of 51 Montana counties and 1185th of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Cascade County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 4, 2024 23:30 | October 6, 2024 23:45 | 2d | 12,024 | 61K |
| 2 | May 7, 2024 17:00 | May 17, 2024 00:15 | 9d 7h | 10,468 | 114K |
| 3 | August 23, 2024 23:00 | August 25, 2024 02:15 | 1d 3h | 3,230 | 14K |
| 4 | June 7, 2024 17:00 | June 7, 2024 21:30 | 4h 30m | 2,361 | 5,693 |
| 5 | October 16, 2024 18:00 | October 17, 2024 00:45 | 6h 45m | 2,351 | 6,888 |
| 6 | May 22, 2024 21:00 | May 23, 2024 00:00 | 3h | 1,852 | 5,091 |
| 7 | November 21, 2024 01:30 | November 21, 2024 03:00 | 1h 30m | 1,557 | 1,948 |
| 8 | November 17, 2024 12:45 | November 17, 2024 22:45 | 10h | 1,522 | 4,295 |
| 9 | September 12, 2024 00:45 | September 12, 2024 10:00 | 9h 15m | 1,518 | 1,914 |
| 10 | August 20, 2024 01:00 | August 20, 2024 07:45 | 6h 45m | 1,513 | 8,918 |
Outage episodes by size in 2024: 52 reached 100+ customers, 17 reached 1,000+ customers, 2 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 2024, 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 2024; 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, 2024, 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/2024/montana/cascade-county