County annual report · FIPS 30091
2017 Sheridan County, MT Power Outage Report
In 2017, customers in Sheridan County, MT went without power for an average of 2.0 hours, a total of 3,522 customer-hours (Montana average 2.7 hours). That ranks 6th worst of 19 Montana counties and 1633rd 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 Sheridan 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 | March 23, 2017 19:30 | March 23, 2017 19:45 | 15m | 649 | 162 |
| 2 | March 16, 2017 01:30 | March 16, 2017 04:30 | 3h | 337 | 90 |
| 3 | August 17, 2017 05:30 | August 17, 2017 07:45 | 2h 15m | 172 | 336 |
| 4 | April 17, 2017 17:15 | April 17, 2017 19:15 | 2h | 104 | 186 |
| 5 | June 8, 2017 12:45 | June 8, 2017 13:00 | 15m | 67 | 17 |
| 6 | December 21, 2017 16:15 | December 21, 2017 18:15 | 2h | 62 | 109 |
| 7 | March 30, 2017 22:15 | March 31, 2017 09:15 | 11h | 24 | 254 |
| 8 | July 27, 2017 22:15 | July 28, 2017 03:15 | 5h | 24 | 105 |
| 9 | March 7, 2017 00:30 | March 7, 2017 21:00 | 20h 30m | 18 | 50 |
| 10 | June 27, 2017 22:30 | July 6, 2017 22:45 | 9d | 17 | 951 |
Outage episodes by size in 2017: 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 Sheridan 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 |
|---|---|---|---|---|---|
| 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 2017; 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, 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/). https://massoutage.com/reports/2017/montana/sheridan-county