County annual report · FIPS 30087
2019 Rosebud County, MT Power Outage Report
In 2019, customers in Rosebud County, MT went without power for an average of 4.3 hours, a total of 20K customer-hours (Montana average 0.6 hours). That ranks 2nd worst of 38 Montana counties and 1242nd of 2,945 nationally.
Compared with MT, the US and 2018
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Rosebud County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 5, 2019 13:15 | June 5, 2019 16:00 | 2h 45m | 1,130 | 3,009 |
| 2 | October 6, 2019 17:15 | October 6, 2019 17:30 | 15m | 1,111 | 278 |
| 3 | April 22, 2019 08:45 | April 22, 2019 09:00 | 15m | 1,076 | 269 |
| 4 | September 19, 2019 06:15 | September 19, 2019 14:30 | 8h 15m | 1,072 | 8,838 |
| 5 | July 14, 2019 02:15 | July 14, 2019 06:15 | 4h | 1,071 | 4,004 |
| 6 | August 1, 2019 06:15 | August 1, 2019 10:15 | 4h | 781 | 3,121 |
| 7 | April 21, 2019 20:15 | April 21, 2019 21:15 | 1h | 318 | 129 |
| 8 | September 21, 2019 02:15 | September 21, 2019 04:00 | 1h 45m | 177 | 309 |
| 9 | December 17, 2019 20:45 | December 17, 2019 21:00 | 15m | 177 | 44 |
| 10 | November 6, 2019 22:30 | November 6, 2019 22:45 | 15m | 176 | 44 |
Outage episodes by size in 2019: 10 reached 100+ customers, 5 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 2019, 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) | 2018 | 1.7 hrs | 1.08 | 1.7 hrs | 1.08 |
| 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 75% of Montana's customers in 2019; 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, 2019, 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/2019/montana/rosebud-county