County annual report · FIPS 56003
2021 Big Horn County, WY Power Outage Report
In 2021, customers in Big Horn County, WY went without power for an average of 3.6 hours, a total of 14K customer-hours (Wyoming average 2.2 hours). That ranks 7th worst of 20 Wyoming counties and 1644th 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 Big Horn 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 | July 9, 2021 23:30 | July 10, 2021 03:00 | 3h 30m | 2,303 | 1,314 |
| 2 | April 8, 2021 22:15 | April 9, 2021 01:15 | 3h | 1,771 | 3,173 |
| 3 | May 6, 2021 14:15 | May 6, 2021 17:45 | 3h 30m | 1,271 | 3,838 |
| 4 | June 8, 2021 22:30 | June 9, 2021 04:00 | 5h 30m | 579 | 1,393 |
| 5 | April 6, 2021 14:30 | April 6, 2021 14:45 | 15m | 512 | 128 |
| 6 | March 29, 2021 12:45 | March 30, 2021 00:15 | 11h 30m | 511 | 1,799 |
| 7 | August 15, 2021 03:00 | August 15, 2021 05:45 | 2h 45m | 307 | 662 |
| 8 | October 13, 2021 17:45 | October 13, 2021 19:30 | 1h 45m | 290 | 156 |
| 9 | July 31, 2021 00:15 | July 31, 2021 02:30 | 2h 15m | 156 | 107 |
| 10 | July 4, 2021 01:15 | July 4, 2021 04:00 | 2h 45m | 138 | 166 |
Outage episodes by size in 2021: 10 reached 100+ customers, 3 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 Big Horn 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 |
|---|---|---|---|---|---|
| PacifiCorp | 2021 | 4.3 hrs | 1.86 | 2.0 hrs | 1.19 |
| Powder River Energy Corp | 2021 | 5.4 hrs | 2.15 | 3.9 hrs | 1.91 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| High Plains Power Inc | - | - | - | - | - |
| Garland Light & Power Company | - | - | - | - | - |
| City of Deaver - (WY) | - | - | - | - | - |
| Town of Basin - (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 ÷ 3,930 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. Big Horn County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Big Horn 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/big-horn-county