County annual report · FIPS 30085
2018 Roosevelt County, MT Power Outage Report
In 2018, customers in Roosevelt County, MT went without power for an average of 0.6 hours, a total of 4,174 customer-hours (Montana average 1.9 hours). That ranks 11th worst of 20 Montana counties and 2472nd of 2,798 nationally.
Compared with MT, the US and 2017
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Roosevelt County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 7, 2018 13:45 | January 7, 2018 18:15 | 4h 30m | 687 | 819 |
| 2 | March 5, 2018 21:30 | March 5, 2018 23:30 | 2h | 599 | 1,179 |
| 3 | June 6, 2018 16:15 | June 6, 2018 18:15 | 2h | 260 | 345 |
| 4 | June 29, 2018 01:45 | June 29, 2018 03:30 | 1h 45m | 176 | 138 |
| 5 | July 10, 2018 13:15 | July 10, 2018 16:15 | 3h | 54 | 152 |
| 6 | July 11, 2018 01:45 | July 11, 2018 02:15 | 30m | 54 | 17 |
| 7 | September 22, 2018 20:15 | September 22, 2018 21:30 | 1h 15m | 54 | 65 |
| 8 | May 23, 2018 16:15 | May 23, 2018 18:00 | 1h 45m | 42 | 30 |
| 9 | January 31, 2018 19:30 | January 31, 2018 20:00 | 30m | 37 | 19 |
| 10 | August 6, 2018 00:30 | August 6, 2018 02:00 | 1h 30m | 31 | 12 |
Outage episodes by size in 2018: 4 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 2018, 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 16% of Montana's customers in 2018; 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, 2018, 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/2018/montana/roosevelt-county