County annual report · FIPS 56011
2021 Crook County, WY Power Outage Report
In 2021, customers in Crook County, WY went without power for an average of 10.1 hours, a total of 46K customer-hours (Wyoming average 2.2 hours). That ranks 1st worst of 20 Wyoming counties and 773rd of 2,974 nationally.
Compared with WY, the US and 2020
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Crook County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 8, 2021 01:45 | June 8, 2021 14:15 | 12h 30m | 1,462 | 3,602 |
| 2 | June 23, 2021 01:00 | June 23, 2021 13:30 | 12h 30m | 1,197 | 4,597 |
| 3 | June 24, 2021 18:15 | June 24, 2021 18:30 | 15m | 1,193 | 298 |
| 4 | August 16, 2021 15:15 | August 16, 2021 19:00 | 3h 45m | 1,096 | 278 |
| 5 | June 23, 2021 23:00 | June 24, 2021 13:30 | 14h 30m | 900 | 9,951 |
| 6 | June 22, 2021 23:45 | June 23, 2021 00:00 | 15m | 882 | 221 |
| 7 | August 10, 2021 15:15 | August 10, 2021 15:30 | 15m | 845 | 211 |
| 8 | May 8, 2021 18:30 | May 8, 2021 19:15 | 45m | 826 | 235 |
| 9 | August 11, 2021 00:15 | August 11, 2021 01:30 | 1h 15m | 826 | 826 |
| 10 | December 15, 2021 17:45 | December 15, 2021 18:00 | 15m | 799 | 200 |
Outage episodes by size in 2021: 44 reached 100+ customers, 4 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 Crook County reported on EIA Form 861 for 2021, 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 |
|---|---|---|---|---|---|
| Black Hills Power, Inc. | 2021 | 2.6 hrs | 1.17 | 41 min | 0.32 |
| Powder River Energy Corp | 2021 | 5.4 hrs | 2.15 | 3.9 hrs | 1.91 |
| Southeast Electric Coop, Inc | - | - | - | - | - |
| City of Gillette - (WY) | - | - | - | - | - |
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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,545 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. Crook County has data for 2016, 2018–2025.
Cite this report
MassOutage (massoutage.com), Crook County, WY annual power outage report, 2021, 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/2021/wyoming/crook-county