County annual report · FIPS 30087
2017 Rosebud County, MT Power Outage Report
In 2017, customers in Rosebud County, MT went without power for an average of 1.5 hours, a total of 6,792 customer-hours (Montana average 2.7 hours). That ranks 8th worst of 19 Montana counties and 1839th of 2,786 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Rosebud County, 2017
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 26, 2017 13:15 | October 26, 2017 14:30 | 1h 15m | 1,185 | 1,481 |
| 2 | August 18, 2017 08:15 | August 18, 2017 12:15 | 4h | 1,170 | 3,033 |
| 3 | July 6, 2017 00:30 | July 6, 2017 02:45 | 2h 15m | 1,164 | 554 |
| 4 | August 14, 2017 22:15 | August 15, 2017 16:30 | 18h 15m | 1,137 | 320 |
| 5 | December 19, 2017 20:45 | December 19, 2017 22:00 | 1h 15m | 1,108 | 919 |
| 6 | October 7, 2017 16:30 | October 7, 2017 17:15 | 45m | 113 | 41 |
| 7 | December 19, 2017 19:15 | December 19, 2017 19:30 | 15m | 101 | 25 |
| 8 | July 31, 2017 01:30 | July 31, 2017 02:00 | 30m | 77 | 39 |
| 9 | August 7, 2017 21:45 | August 7, 2017 22:00 | 15m | 77 | 19 |
| 10 | June 21, 2017 04:45 | June 21, 2017 05:00 | 15m | 55 | 14 |
Outage episodes by size in 2017: 7 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 2017, 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) | 2017 | 2.6 hrs | 1.38 | 2.4 hrs | 1.30 |
| Mid-Yellowstone Elec Coop, Inc | 2017 | 4.6 hrs | 2.65 | 4.6 hrs | 2.65 |
| 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 n/a of Montana's customers in 2017; 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, 2017, 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/2017/montana/rosebud-county