County annual report · FIPS 56025
2018 Natrona County, WY Power Outage Report
In 2018, customers in Natrona County, WY went without power for an average of 1.0 hours, a total of 47K customer-hours (Wyoming average 1.2 hours). That ranks 9th worst of 21 Wyoming counties and 2312th of 2,798 nationally.
Compared with WY, the US and 2017
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Natrona County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 17, 2018 14:30 | October 17, 2018 20:30 | 6h | 2,694 | 4,811 |
| 2 | March 7, 2018 20:30 | March 8, 2018 02:15 | 5h 45m | 2,631 | 1,466 |
| 3 | June 11, 2018 23:00 | June 12, 2018 01:15 | 2h 15m | 2,049 | 2,999 |
| 4 | April 28, 2018 20:00 | April 28, 2018 23:15 | 3h 15m | 1,716 | 741 |
| 5 | September 3, 2018 17:30 | September 3, 2018 21:15 | 3h 45m | 1,250 | 1,544 |
| 6 | April 29, 2018 18:00 | April 29, 2018 19:30 | 1h 30m | 1,146 | 484 |
| 7 | July 25, 2018 23:45 | July 26, 2018 05:15 | 5h 30m | 693 | 1,108 |
| 8 | July 29, 2018 02:15 | July 29, 2018 04:00 | 1h 45m | 681 | 1,040 |
| 9 | November 18, 2018 17:30 | November 18, 2018 21:30 | 4h | 582 | 2,038 |
| 10 | June 8, 2018 16:15 | June 8, 2018 18:45 | 2h 30m | 428 | 434 |
Outage episodes by size in 2018: 50 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 Natrona County reported on EIA Form 861 for 2018, 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| 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 62% of Wyoming's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 47,992 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. Natrona County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Natrona County, WY annual power outage report, 2018, 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/2018/wyoming/natrona-county