County annual report · FIPS 30087
2020 Rosebud County, MT Power Outage Report
In 2020, customers in Rosebud County, MT went without power for an average of 3.2 hours, a total of 15K customer-hours (Montana average 5.6 hours). That ranks 34th worst of 50 Montana counties and 1806th of 3,019 nationally.
Compared with MT, the US and 2019
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Rosebud County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 13, 2020 02:30 | July 15, 2020 22:00 | 2d 19h | 1,232 | 6,466 |
| 2 | August 27, 2020 10:00 | August 27, 2020 12:00 | 2h | 1,133 | 847 |
| 3 | May 21, 2020 01:15 | May 21, 2020 03:00 | 1h 45m | 1,076 | 807 |
| 4 | June 13, 2020 23:00 | June 14, 2020 05:00 | 6h | 1,019 | 637 |
| 5 | October 11, 2020 14:30 | October 12, 2020 21:15 | 1d 6h | 915 | 1,013 |
| 6 | November 20, 2020 01:15 | November 20, 2020 01:30 | 15m | 274 | 69 |
| 7 | August 25, 2020 23:15 | August 25, 2020 23:45 | 30m | 201 | 66 |
| 8 | June 7, 2020 06:30 | June 7, 2020 15:45 | 9h 15m | 182 | 869 |
| 9 | July 5, 2020 00:15 | July 6, 2020 21:30 | 1d 21h | 182 | 619 |
| 10 | June 28, 2020 05:30 | June 28, 2020 11:45 | 6h 15m | 156 | 328 |
Outage episodes by size in 2020: 12 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 Rosebud County reported on EIA Form 861 for 2020, 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) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| Mid-Yellowstone Elec Coop, Inc | 2018 | 4.5 hrs | 3.82 | 4.5 hrs | 3.82 |
| 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 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,647 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. Rosebud County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Rosebud County, MT annual power outage report, 2020, 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/2020/montana/rosebud-county