County annual report · FIPS 30085
2021 Roosevelt County, MT Power Outage Report
In 2021, customers in Roosevelt County, MT went without power for an average of 1.5 hours, a total of 11K customer-hours (Montana average 5.0 hours). That ranks 41st worst of 51 Montana counties and 2453rd 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 Roosevelt 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 | December 18, 2021 13:15 | December 18, 2021 18:15 | 5h | 772 | 3,667 |
| 2 | June 11, 2021 04:00 | June 11, 2021 16:00 | 12h | 648 | 1,977 |
| 3 | June 9, 2021 01:45 | June 9, 2021 07:15 | 5h 30m | 647 | 1,199 |
| 4 | January 14, 2021 07:30 | January 14, 2021 10:15 | 2h 45m | 644 | 895 |
| 5 | June 11, 2021 17:45 | June 11, 2021 19:00 | 1h 15m | 614 | 428 |
| 6 | May 26, 2021 15:15 | June 5, 2021 14:45 | 9d 23h | 371 | 1,860 |
| 7 | May 16, 2021 10:00 | May 16, 2021 13:00 | 3h | 117 | 351 |
| 8 | November 3, 2021 14:30 | November 3, 2021 14:45 | 15m | 116 | 29 |
| 9 | July 8, 2021 23:00 | July 9, 2021 01:45 | 2h 45m | 115 | 310 |
| 10 | September 24, 2021 21:00 | September 25, 2021 01:30 | 4h 30m | 57 | 57 |
Outage episodes by size in 2021: 9 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 Roosevelt 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 | - | - | - | - | - |
| Mountrail-Williams Elec Coop | - | - | - | - | - |
| Sheridan Electric Coop, Inc | - | - | - | - | - |
| Lower Yellowstone R E A, Inc | - | - | - | - | - |
| NorVal Electric Cooperative, 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 ÷ 7,252 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. Roosevelt County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Roosevelt 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/roosevelt-county