County annual report · FIPS 30015
2021 Chouteau County, MT Power Outage Report
In 2021, customers in Chouteau County, MT went without power for an average of 12.2 hours, a total of 24K customer-hours (Montana average 5.0 hours). That ranks 11th worst of 51 Montana counties and 676th of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Chouteau County, 2021
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 27, 2021 14:30 | October 28, 2021 00:00 | 9h 30m | 1,428 | 1,122 |
| 2 | February 22, 2021 02:00 | February 22, 2021 22:45 | 20h 45m | 1,087 | 4,802 |
| 3 | January 13, 2021 17:15 | January 14, 2021 05:00 | 11h 45m | 769 | 2,800 |
| 4 | January 30, 2021 00:00 | January 30, 2021 04:15 | 4h 15m | 616 | 2,463 |
| 5 | July 11, 2021 23:30 | July 12, 2021 09:30 | 10h | 614 | 1,579 |
| 6 | September 3, 2021 23:45 | September 4, 2021 02:30 | 2h 45m | 494 | 1,359 |
| 7 | December 1, 2021 05:45 | December 1, 2021 12:00 | 6h 15m | 491 | 2,452 |
| 8 | April 11, 2021 08:45 | April 11, 2021 11:45 | 3h | 468 | 1,404 |
| 9 | November 5, 2021 02:45 | November 5, 2021 06:30 | 3h 45m | 464 | 1,625 |
| 10 | January 27, 2021 21:00 | January 27, 2021 23:15 | 2h 15m | 263 | 330 |
Outage episodes by size in 2021: 14 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 Chouteau County reported on EIA Form 861 for 2021, 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) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| 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 76% of Montana's customers in 2021; 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, 2021, 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/2021/montana/chouteau-county