County annual report · FIPS 56019
2020 Johnson County, WY Power Outage Report
In 2020, customers in Johnson County, WY went without power for an average of 9.8 hours, a total of 53K customer-hours (Wyoming average 3.4 hours). That ranks 4th worst of 22 Wyoming counties and 802nd of 3,019 nationally.
Compared with WY, the US and 2019
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Johnson County, 2020
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 30, 2020 15:15 | August 31, 2020 07:00 | 15h 45m | 2,053 | 2,225 |
| 2 | October 27, 2020 21:00 | October 28, 2020 03:30 | 6h 30m | 1,079 | 6,757 |
| 3 | September 8, 2020 18:00 | September 10, 2020 16:30 | 1d 22h | 1,052 | 6,976 |
| 4 | September 7, 2020 23:00 | September 8, 2020 04:00 | 5h | 1,031 | 4,636 |
| 5 | June 10, 2020 14:15 | June 10, 2020 15:15 | 1h | 1,021 | 1,021 |
| 6 | June 10, 2020 20:15 | June 10, 2020 22:15 | 2h | 1,021 | 1,277 |
| 7 | October 14, 2020 15:15 | October 14, 2020 22:30 | 7h 15m | 687 | 3,877 |
| 8 | March 12, 2020 10:00 | March 12, 2020 13:15 | 3h 15m | 682 | 1,111 |
| 9 | November 18, 2020 16:15 | November 18, 2020 16:30 | 15m | 495 | 124 |
| 10 | February 3, 2020 02:15 | February 3, 2020 07:15 | 5h | 379 | 1,263 |
Outage episodes by size in 2020: 34 reached 100+ customers, 6 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 2020, 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 | 2020 | 6.8 hrs | 1.88 | 2.0 hrs | 1.22 |
| Powder River Energy Corp | 2020 | 4.8 hrs | 2.30 | 3.2 hrs | 1.94 |
| 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 71% of Wyoming's customers in 2020; 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, 2020, 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/2020/wyoming/johnson-county