County annual report · FIPS 56003
2023 Big Horn County, WY Power Outage Report
In 2023, customers in Big Horn County, WY went without power for an average of 3.0 hours, a total of 12K customer-hours (Wyoming average 2.0 hours). That ranks 6th worst of 20 Wyoming counties and 1939th of 2,977 nationally.
Compared with WY, the US and 2022
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Big Horn County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 27, 2023 17:45 | April 27, 2023 19:45 | 2h | 1,582 | 1,379 |
| 2 | May 26, 2023 22:15 | May 27, 2023 01:00 | 2h 45m | 1,450 | 2,180 |
| 3 | March 25, 2023 04:30 | March 25, 2023 07:30 | 3h | 1,282 | 3,325 |
| 4 | June 12, 2023 12:30 | June 12, 2023 14:45 | 2h 15m | 1,282 | 2,449 |
| 5 | June 20, 2023 19:15 | June 20, 2023 22:15 | 3h | 527 | 722 |
| 6 | May 22, 2023 22:15 | May 23, 2023 00:45 | 2h 30m | 312 | 305 |
| 7 | January 10, 2023 01:30 | January 10, 2023 05:30 | 4h | 147 | 588 |
| 8 | February 16, 2023 18:15 | February 16, 2023 18:30 | 15m | 146 | 37 |
| 9 | May 20, 2023 19:00 | May 20, 2023 20:30 | 1h 30m | 125 | 105 |
| 10 | August 7, 2023 01:30 | August 7, 2023 03:00 | 1h 30m | 41 | 62 |
Outage episodes by size in 2023: 9 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 Big Horn County reported on EIA Form 861 for 2023, 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 | 2023 | 8.2 hrs | 1.42 | 1.9 hrs | 0.99 |
| High Plains Power Inc | 2023 | 5.4 hrs | - | 5.4 hrs | - |
| Powder River Energy Corp | 2023 | 3.4 hrs | 1.40 | 3.4 hrs | 1.40 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| 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 n/a of Wyoming's customers in 2023; 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, 2023, 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/2023/wyoming/big-horn-county