County annual report · FIPS 56019
2023 Johnson County, WY Power Outage Report
In 2023, customers in Johnson County, WY went without power for an average of 4.4 hours, a total of 24K customer-hours (Wyoming average 2.0 hours). That ranks 3rd worst of 20 Wyoming counties and 1599th of 2,977 nationally.
Compared with WY, the US and 2022
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Johnson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 23, 2023 21:30 | June 25, 2023 02:15 | 1d 4h | 851 | 3,925 |
| 2 | February 25, 2023 07:45 | February 25, 2023 14:30 | 6h 45m | 481 | 1,386 |
| 3 | February 27, 2023 14:45 | February 27, 2023 15:15 | 30m | 433 | 190 |
| 4 | April 13, 2023 15:30 | April 13, 2023 16:15 | 45m | 388 | 102 |
| 5 | June 8, 2023 03:30 | June 8, 2023 08:45 | 5h 15m | 318 | 540 |
| 6 | January 10, 2023 22:30 | January 10, 2023 23:30 | 1h | 259 | 206 |
| 7 | June 2, 2023 21:15 | June 3, 2023 14:15 | 17h | 246 | 1,102 |
| 8 | October 12, 2023 11:45 | October 13, 2023 20:30 | 1d 8h | 193 | 3,436 |
| 9 | June 10, 2023 02:15 | June 10, 2023 04:30 | 2h 15m | 192 | 195 |
| 10 | June 12, 2023 16:00 | June 13, 2023 14:15 | 22h 15m | 192 | 69 |
Outage episodes by size in 2023: 25 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 2023, 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 | 2023 | 8.2 hrs | 1.42 | 1.9 hrs | 0.99 |
| High Plains Power Inc | 2023 | 5.4 hrs | - | 5.4 hrs | - |
| Powder River Energy Corp | 2023 | 3.4 hrs | 1.40 | 3.4 hrs | 1.40 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
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 2023; 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, 2023, 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/2023/wyoming/johnson-county