County annual report · FIPS 56019
2019 Johnson County, WY Power Outage Report
In 2019, customers in Johnson County, WY went without power for an average of 1.7 hours, a total of 9,165 customer-hours (Wyoming average 1.3 hours). That ranks 8th worst of 22 Wyoming counties and 2194th of 2,945 nationally.
Compared with WY, the US and 2018
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Johnson County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 18, 2019 19:00 | August 18, 2019 23:00 | 4h | 683 | 707 |
| 2 | March 22, 2019 11:15 | March 22, 2019 14:00 | 2h 45m | 398 | 301 |
| 3 | April 4, 2019 19:30 | April 4, 2019 23:30 | 4h | 398 | 338 |
| 4 | September 6, 2019 22:15 | September 7, 2019 20:45 | 22h 30m | 328 | 585 |
| 5 | July 24, 2019 17:15 | July 25, 2019 02:30 | 9h 15m | 327 | 173 |
| 6 | September 7, 2019 23:30 | September 8, 2019 11:45 | 12h 15m | 327 | 448 |
| 7 | September 12, 2019 12:00 | September 13, 2019 05:00 | 17h | 327 | 161 |
| 8 | August 15, 2019 15:15 | August 15, 2019 21:15 | 6h | 326 | 87 |
| 9 | August 28, 2019 22:15 | August 29, 2019 05:15 | 7h | 326 | 100 |
| 10 | January 16, 2019 15:45 | January 16, 2019 17:00 | 1h 15m | 291 | 145 |
Outage episodes by size in 2019: 13 reached 100+ customers, 0 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 2019, 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 | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| High Plains Power Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 68% of Wyoming's customers in 2019; 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, 2019, 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/2019/wyoming/johnson-county