County annual report · FIPS 56019
2024 Johnson County, WY Power Outage Report
In 2024, customers in Johnson County, WY went without power for an average of 7.0 hours, a total of 38K customer-hours (Wyoming average 2.4 hours). That ranks 5th worst of 20 Wyoming counties and 1252nd of 2,990 nationally.
Compared with WY, the US and 2023
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Johnson County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 5, 2024 17:30 | January 5, 2024 21:30 | 4h | 1,290 | 1,367 |
| 2 | June 6, 2024 06:00 | June 6, 2024 10:45 | 4h 45m | 1,200 | 5,699 |
| 3 | October 4, 2024 15:45 | October 4, 2024 19:00 | 3h 15m | 629 | 790 |
| 4 | July 23, 2024 14:00 | July 23, 2024 17:00 | 3h | 623 | 315 |
| 5 | August 6, 2024 21:30 | August 7, 2024 03:45 | 6h 15m | 569 | 448 |
| 6 | October 5, 2024 06:30 | October 5, 2024 12:00 | 5h 30m | 543 | 1,167 |
| 7 | May 21, 2024 10:45 | May 22, 2024 01:15 | 14h 30m | 481 | 917 |
| 8 | June 16, 2024 03:15 | June 16, 2024 11:15 | 8h | 464 | 2,872 |
| 9 | July 14, 2024 03:15 | July 14, 2024 04:15 | 1h | 464 | 117 |
| 10 | July 21, 2024 11:30 | July 21, 2024 13:30 | 2h | 464 | 581 |
Outage episodes by size in 2024: 38 reached 100+ customers, 2 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 Johnson County reported on EIA Form 861 for 2024, 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 |
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| 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 | - | - |
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 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 5,448 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. Johnson County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Johnson County, WY annual power outage report, 2024, 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/2024/wyoming/johnson-county