County annual report · FIPS 30091
2024 Sheridan County, MT Power Outage Report
In 2024, customers in Sheridan County, MT went without power for an average of 2.4 hours, a total of 4,308 customer-hours (Montana average 8.5 hours). That ranks 37th worst of 51 Montana counties and 2283rd of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sheridan County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 16, 2024 19:45 | November 16, 2024 20:15 | 30m | 629 | 315 |
| 2 | November 16, 2024 16:00 | November 16, 2024 18:45 | 2h 45m | 617 | 276 |
| 3 | June 5, 2024 17:30 | June 6, 2024 22:45 | 1d 5h | 616 | 3,456 |
| 4 | August 25, 2024 07:30 | August 25, 2024 07:45 | 15m | 70 | 18 |
| 5 | July 6, 2024 19:15 | July 6, 2024 21:15 | 2h | 28 | 43 |
| 6 | January 3, 2024 17:15 | January 3, 2024 20:00 | 2h 45m | 15 | 41 |
| 7 | June 28, 2024 13:30 | June 28, 2024 14:15 | 45m | 14 | 10 |
| 8 | July 17, 2024 20:30 | July 17, 2024 23:45 | 3h 15m | 8 | 26 |
| 9 | March 10, 2024 20:30 | March 11, 2024 15:15 | 18h 45m | 6 | 113 |
| 10 | July 19, 2024 21:30 | July 19, 2024 21:45 | 15m | 6 | 2 |
Outage episodes by size in 2024: 3 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 Sheridan County reported on EIA Form 861 for 2024, 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Sheridan 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 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,766 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. Sheridan County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sheridan County, MT annual power outage report, 2024, 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/2024/montana/sheridan-county