County annual report · FIPS 56033
2018 Sheridan County, WY Power Outage Report
In 2018, customers in Sheridan County, WY went without power for an average of 0.8 hours, a total of 13K customer-hours (Wyoming average 1.2 hours). That ranks 12th worst of 21 Wyoming counties and 2412th of 2,798 nationally.
Compared with WY, the US and 2017
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Sheridan County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 14, 2018 23:30 | August 15, 2018 09:15 | 9h 45m | 828 | 1,688 |
| 2 | September 28, 2018 04:30 | September 28, 2018 21:00 | 16h 30m | 815 | 3,058 |
| 3 | July 28, 2018 01:00 | July 29, 2018 09:15 | 1d 8h | 294 | 1,835 |
| 4 | September 13, 2018 05:15 | September 13, 2018 11:15 | 6h | 290 | 1,613 |
| 5 | October 3, 2018 05:00 | October 3, 2018 10:15 | 5h 15m | 288 | 1,380 |
| 6 | May 7, 2018 07:45 | May 7, 2018 14:45 | 7h | 271 | 375 |
| 7 | May 27, 2018 07:15 | May 27, 2018 15:00 | 7h 45m | 173 | 277 |
| 8 | July 10, 2018 19:45 | July 10, 2018 21:45 | 2h | 147 | 89 |
| 9 | September 25, 2018 19:30 | September 25, 2018 20:30 | 1h | 126 | 54 |
| 10 | June 30, 2018 22:15 | July 1, 2018 09:15 | 11h | 97 | 446 |
Outage episodes by size in 2018: 9 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 2018, 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 | 2018 | 2.8 hrs | 1.52 | 2.8 hrs | 1.52 |
| 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 62% of Wyoming's customers in 2018; 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, 2018, 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/2018/wyoming/sheridan-county