County annual report · FIPS 56019
2017 Johnson County, WY Power Outage Report
In 2017, customers in Johnson County, WY went without power for an average of 0.3 hours, a total of 1,713 customer-hours (Wyoming average 0.9 hours). That ranks 16th worst of 19 Wyoming counties and 2400th of 2,786 nationally.
Compared with WY, the US
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Johnson County, 2017
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 17, 2017 18:15 | November 17, 2017 19:45 | 1h 30m | 471 | 362 |
| 2 | November 23, 2017 21:30 | November 23, 2017 23:00 | 1h 30m | 380 | 523 |
| 3 | November 16, 2017 16:30 | November 16, 2017 22:00 | 5h 30m | 94 | 517 |
| 4 | September 15, 2017 06:15 | September 15, 2017 08:00 | 1h 45m | 55 | 96 |
| 5 | November 15, 2017 17:00 | November 15, 2017 19:30 | 2h 30m | 16 | 20 |
| 6 | December 5, 2017 16:30 | December 5, 2017 16:45 | 15m | 13 | 3 |
| 7 | April 9, 2017 19:45 | April 9, 2017 22:00 | 2h 15m | 9 | 13 |
| 8 | March 7, 2017 07:00 | March 7, 2017 10:00 | 3h | 8 | 23 |
| 9 | August 6, 2017 21:30 | August 6, 2017 23:45 | 2h 15m | 8 | 18 |
| 10 | September 1, 2017 12:30 | September 1, 2017 13:00 | 30m | 8 | 2 |
Outage episodes by size in 2017: 2 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 2017, 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 | 2017 | 5.2 hrs | 2.01 | 2.4 hrs | 1.43 |
| Powder River Energy Corp | 2017 | 4.9 hrs | 2.23 | 4.9 hrs | 2.23 |
| Big Horn Rural Electric Co | 2017 | 3.1 hrs | 1.11 | - | - |
| 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 n/a of Wyoming's customers in 2017; 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, 2017, 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/2017/wyoming/johnson-county