County annual report · FIPS 56003
2018 Big Horn County, WY Power Outage Report
In 2018, customers in Big Horn County, WY went without power for an average of 4.4 hours, a total of 17K customer-hours (Wyoming average 1.2 hours). That ranks 4th worst of 21 Wyoming counties and 1167th 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 Big Horn 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 | October 15, 2018 03:15 | October 15, 2018 04:00 | 45m | 1,765 | 867 |
| 2 | October 1, 2018 12:00 | October 1, 2018 22:30 | 10h 30m | 1,423 | 2,581 |
| 3 | May 27, 2018 23:00 | May 28, 2018 08:00 | 9h | 1,319 | 2,507 |
| 4 | July 27, 2018 00:45 | July 27, 2018 22:45 | 22h | 755 | 6,120 |
| 5 | April 29, 2018 20:15 | April 30, 2018 00:45 | 4h 30m | 534 | 1,205 |
| 6 | June 8, 2018 22:45 | June 9, 2018 00:00 | 1h 15m | 315 | 81 |
| 7 | April 22, 2018 00:30 | April 22, 2018 03:30 | 3h | 305 | 168 |
| 8 | January 10, 2018 19:30 | January 10, 2018 23:45 | 4h 15m | 303 | 1,288 |
| 9 | February 21, 2018 15:15 | February 21, 2018 19:00 | 3h 45m | 204 | 300 |
| 10 | July 18, 2018 21:00 | July 18, 2018 23:15 | 2h 15m | 204 | 66 |
Outage episodes by size in 2018: 13 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 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 |
|---|---|---|---|---|---|
| PacifiCorp | 2018 | 3.2 hrs | 1.62 | 2.0 hrs | 1.25 |
| 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 | - | - |
| 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 62% of Wyoming's customers in 2018; 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, 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/big-horn-county