County annual report · FIPS 30015
2025 Chouteau County, MT Power Outage Report
In 2025, customers in Chouteau County, MT went without power for an average of 20.8 hours, a total of 41K customer-hours (Montana average 6.8 hours). That ranks 8th worst of 51 Montana counties and 332nd 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 Chouteau 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 13:30 | December 19, 2025 20:45 | 2d 7h | 1,793 | 19K |
| 2 | August 1, 2025 15:15 | August 1, 2025 21:15 | 6h | 1,547 | 8,863 |
| 3 | August 7, 2025 11:15 | August 7, 2025 16:30 | 5h 15m | 1,243 | 2,617 |
| 4 | August 21, 2025 11:15 | August 21, 2025 12:15 | 1h | 1,243 | 1,243 |
| 5 | March 25, 2025 13:30 | March 25, 2025 15:45 | 2h 15m | 480 | 963 |
| 6 | August 17, 2025 22:45 | August 18, 2025 00:15 | 1h 30m | 480 | 720 |
| 7 | March 3, 2025 23:00 | March 4, 2025 01:15 | 2h 15m | 476 | 855 |
| 8 | December 23, 2025 09:15 | December 23, 2025 11:15 | 2h | 468 | 936 |
| 9 | April 13, 2025 10:30 | April 13, 2025 14:30 | 4h | 467 | 1,619 |
| 10 | April 22, 2025 13:45 | April 22, 2025 16:30 | 2h 45m | 467 | 1,284 |
Outage episodes by size in 2025: 14 reached 100+ customers, 4 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 Chouteau 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 | - | - | - | - | - |
| Hill County 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 ÷ 1,959 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. Chouteau County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Chouteau 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/chouteau-county