County annual report · FIPS 30013
2023 Cascade County, MT Power Outage Report
In 2023, customers in Cascade County, MT went without power for an average of 1.6 hours, a total of 62K customer-hours (Montana average 1.8 hours). That ranks 31st worst of 50 Montana counties and 2458th of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Cascade County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 26, 2023 01:30 | August 26, 2023 05:45 | 4h 15m | 1,904 | 4,533 |
| 2 | January 27, 2023 21:45 | January 28, 2023 05:00 | 7h 15m | 1,790 | 2,499 |
| 3 | October 10, 2023 20:00 | October 10, 2023 21:00 | 1h | 1,772 | 1,772 |
| 4 | May 27, 2023 18:30 | May 28, 2023 00:15 | 5h 45m | 1,737 | 4,779 |
| 5 | March 26, 2023 18:30 | March 26, 2023 22:00 | 3h 30m | 1,521 | 4,683 |
| 6 | August 21, 2023 15:30 | August 21, 2023 17:45 | 2h 15m | 1,339 | 2,050 |
| 7 | January 27, 2023 15:45 | January 27, 2023 21:00 | 5h 15m | 1,319 | 2,689 |
| 8 | April 3, 2023 02:45 | April 3, 2023 06:15 | 3h 30m | 1,070 | 3,745 |
| 9 | July 17, 2023 15:45 | July 17, 2023 18:30 | 2h 45m | 1,070 | 2,406 |
| 10 | July 22, 2023 11:45 | July 22, 2023 14:00 | 2h 15m | 1,069 | 1,342 |
Outage episodes by size in 2023: 36 reached 100+ customers, 11 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| 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 2023; 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, 2023, 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/2023/montana/cascade-county