County annual report · FIPS 30079
2021 Prairie County, MT Power Outage Report
In 2021, customers in Prairie County, MT went without power for an average of 1.1 hours, a total of 800 customer-hours (Montana average 5.0 hours). That ranks 46th worst of 51 Montana counties and 2639th 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 Prairie 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 | August 12, 2021 17:15 | August 12, 2021 18:00 | 45m | 451 | 336 |
| 2 | March 28, 2021 11:30 | March 28, 2021 14:45 | 3h 15m | 165 | 347 |
| 3 | May 13, 2021 20:00 | May 13, 2021 20:45 | 45m | 11 | 8 |
| 4 | January 21, 2021 16:15 | January 21, 2021 18:00 | 1h 45m | 10 | 14 |
| 5 | July 1, 2021 14:15 | July 1, 2021 19:15 | 5h | 10 | 45 |
| 6 | July 4, 2021 22:45 | July 5, 2021 02:00 | 3h 15m | 9 | 23 |
| 7 | January 14, 2021 21:45 | January 14, 2021 22:00 | 15m | 6 | 2 |
| 8 | February 18, 2021 21:45 | February 19, 2021 00:15 | 2h 30m | 6 | 14 |
| 9 | June 30, 2021 22:30 | June 30, 2021 23:00 | 30m | 6 | 3 |
| 10 | January 13, 2021 18:45 | January 13, 2021 20:00 | 1h 15m | 5 | 6 |
Outage episodes by size in 2021: 2 reached 100+ customers, 0 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 Prairie 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| McCone Electric Coop Inc | - | - | - | - | - |
| Tongue 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 76% of Montana's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 758 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. Prairie County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Prairie 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/). https://massoutage.com/reports/2021/montana/prairie-county