County annual report · FIPS 56033
2020 Sheridan County, WY Power Outage Report
In 2020, customers in Sheridan County, WY went without power for an average of 1.3 hours, a total of 22K customer-hours (Wyoming average 3.4 hours). That ranks 17th worst of 22 Wyoming counties and 2562nd of 3,019 nationally.
Compared with WY, the US and 2019
Coverage line is EAGLE-I's share of Wyoming 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 30, 2020 05:15 | July 30, 2020 12:45 | 7h 30m | 1,008 | 6,335 |
| 2 | October 1, 2020 22:30 | October 2, 2020 16:15 | 17h 45m | 483 | 2,772 |
| 3 | May 9, 2020 09:15 | May 9, 2020 12:30 | 3h 15m | 320 | 734 |
| 4 | March 3, 2020 18:45 | March 3, 2020 21:45 | 3h | 302 | 477 |
| 5 | May 13, 2020 14:45 | May 13, 2020 15:45 | 1h | 243 | 92 |
| 6 | August 18, 2020 15:30 | August 24, 2020 16:30 | 6d 1h | 189 | 2,985 |
| 7 | October 14, 2020 14:15 | October 14, 2020 16:15 | 2h | 156 | 292 |
| 8 | April 8, 2020 02:30 | April 8, 2020 13:30 | 11h | 135 | 1,007 |
| 9 | October 20, 2020 14:30 | October 20, 2020 18:30 | 4h | 126 | 48 |
| 10 | May 1, 2020 13:15 | May 1, 2020 18:00 | 4h 45m | 117 | 238 |
Outage episodes by size in 2020: 14 reached 100+ customers, 1 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 |
|---|---|---|---|---|---|
| Powder River Energy Corp | 2020 | 4.8 hrs | 2.30 | 3.2 hrs | 1.94 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Big Horn County Elec 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 71% of Wyoming's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 17,618 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, WY 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2020/wyoming/sheridan-county