County annual report · FIPS 30091
2023 Sheridan County, MT Power Outage Report
In 2023, customers in Sheridan County, MT went without power for an average of 0.3 hours, a total of 550 customer-hours (Montana average 1.8 hours). That ranks 45th worst of 50 Montana counties and 2858th of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sheridan County, 2023
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 23, 2023 06:00 | July 23, 2023 08:30 | 2h 30m | 79 | 188 |
| 2 | January 20, 2023 04:00 | January 20, 2023 06:15 | 2h 15m | 66 | 114 |
| 3 | January 19, 2023 20:15 | January 19, 2023 22:15 | 2h | 36 | 68 |
| 4 | March 22, 2023 16:30 | March 22, 2023 17:45 | 1h 15m | 33 | 41 |
| 5 | July 25, 2023 01:15 | July 25, 2023 03:30 | 2h 15m | 26 | 59 |
| 6 | April 14, 2023 14:00 | April 14, 2023 14:15 | 15m | 23 | 6 |
| 7 | July 14, 2023 15:00 | July 14, 2023 15:15 | 15m | 15 | 4 |
| 8 | October 21, 2023 22:00 | October 21, 2023 22:15 | 15m | 10 | 3 |
| 9 | December 20, 2023 17:00 | December 20, 2023 22:30 | 5h 30m | 9 | 44 |
| 10 | November 21, 2023 17:15 | November 21, 2023 18:30 | 1h 15m | 7 | 9 |
Outage episodes by size in 2023: 0 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 2023, 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 | - | - | - | - | - |
| 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 2023; 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, 2023, 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/2023/montana/sheridan-county