County annual report · FIPS 56003
2025 Big Horn County, WY Power Outage Report
In 2025, customers in Big Horn County, WY went without power for an average of 4.2 hours, a total of 16K customer-hours (Wyoming average 3.8 hours). That ranks 10th worst of 20 Wyoming counties and 1718th of 3,000 nationally.
Compared with WY, the US and 2024
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Big Horn County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 19, 2025 15:30 | November 19, 2025 19:45 | 4h 15m | 1,675 | 3,137 |
| 2 | June 12, 2025 23:45 | June 13, 2025 05:30 | 5h 45m | 1,596 | 3,671 |
| 3 | September 8, 2025 18:00 | September 8, 2025 22:00 | 4h | 1,455 | 2,008 |
| 4 | September 9, 2025 16:45 | September 9, 2025 18:45 | 2h | 1,455 | 1,096 |
| 5 | June 13, 2025 11:00 | June 13, 2025 14:30 | 3h 30m | 1,278 | 4,168 |
| 6 | August 13, 2025 01:00 | August 13, 2025 03:45 | 2h 45m | 556 | 275 |
| 7 | September 11, 2025 13:00 | September 11, 2025 14:45 | 1h 45m | 539 | 137 |
| 8 | August 22, 2025 17:15 | August 22, 2025 17:45 | 30m | 324 | 162 |
| 9 | February 16, 2025 03:45 | February 16, 2025 07:15 | 3h 30m | 236 | 83 |
| 10 | April 21, 2025 15:30 | April 21, 2025 17:00 | 1h 30m | 236 | 294 |
Outage episodes by size in 2025: 14 reached 100+ customers, 5 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 2025, 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 | 2024 | 4.6 hrs | 1.67 | 2.0 hrs | 1.11 |
| High Plains Power Inc | 2024 | 5.2 hrs | - | 5.2 hrs | - |
| Powder River Energy Corp | 2024 | 8.3 hrs | 2.88 | 4.9 hrs | 2.24 |
| 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 2025; 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, 2025, 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/2025/wyoming/big-horn-county