County annual report · FIPS 30091
2020 Sheridan County, MT Power Outage Report
In 2020, customers in Sheridan County, MT went without power for an average of 5.8 hours, a total of 10K customer-hours (Montana average 5.6 hours). That ranks 23rd worst of 50 Montana counties and 1267th of 3,019 nationally.
Compared with MT, the US and 2019
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sheridan County, 2020
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 24, 2020 01:15 | July 24, 2020 21:15 | 20h | 1,246 | 8,425 |
| 2 | June 11, 2020 01:30 | June 11, 2020 02:15 | 45m | 1,205 | 904 |
| 3 | July 8, 2020 02:15 | July 8, 2020 03:15 | 1h | 152 | 149 |
| 4 | January 21, 2020 16:30 | January 21, 2020 17:15 | 45m | 68 | 51 |
| 5 | January 23, 2020 16:15 | January 23, 2020 17:15 | 1h | 68 | 68 |
| 6 | May 13, 2020 21:15 | May 13, 2020 22:30 | 1h 15m | 27 | 18 |
| 7 | March 3, 2020 06:45 | March 3, 2020 08:15 | 1h 30m | 25 | 31 |
| 8 | June 3, 2020 14:00 | June 3, 2020 18:30 | 4h 30m | 24 | 62 |
| 9 | June 10, 2020 14:15 | June 10, 2020 17:15 | 3h | 23 | 67 |
| 10 | September 19, 2020 06:30 | September 19, 2020 07:00 | 30m | 23 | 8 |
Outage episodes by size in 2020: 3 reached 100+ customers, 2 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 2020, 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 76% of Montana's customers in 2020; 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, 2020, 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/2020/montana/sheridan-county