County annual report · FIPS 56025
2021 Natrona County, WY Power Outage Report
In 2021, customers in Natrona County, WY went without power for an average of 1.7 hours, a total of 81K customer-hours (Wyoming average 2.2 hours). That ranks 12th worst of 20 Wyoming counties and 2365th of 2,974 nationally.
Compared with WY, the US and 2020
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Natrona County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 2, 2021 15:30 | April 2, 2021 23:15 | 7h 45m | 7,526 | 15K |
| 2 | March 10, 2021 02:15 | March 10, 2021 09:15 | 7h | 2,494 | 4,026 |
| 3 | June 15, 2021 15:30 | June 15, 2021 20:00 | 4h 30m | 2,030 | 2,542 |
| 4 | June 28, 2021 01:15 | June 28, 2021 03:00 | 1h 45m | 2,030 | 1,016 |
| 5 | July 31, 2021 01:30 | July 31, 2021 09:15 | 7h 45m | 1,468 | 377 |
| 6 | July 7, 2021 19:00 | July 8, 2021 02:15 | 7h 15m | 1,175 | 905 |
| 7 | March 14, 2021 08:45 | March 15, 2021 07:15 | 22h 30m | 994 | 10K |
| 8 | November 3, 2021 13:15 | November 3, 2021 14:30 | 1h 15m | 757 | 946 |
| 9 | August 7, 2021 09:30 | August 7, 2021 15:45 | 6h 15m | 722 | 3,539 |
| 10 | August 4, 2021 15:15 | August 5, 2021 01:15 | 10h | 562 | 1,002 |
Outage episodes by size in 2021: 59 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 2021, 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 | 2021 | 4.3 hrs | 1.86 | 2.0 hrs | 1.19 |
| 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 71% of Wyoming's customers in 2021; 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, 2021, 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/2021/wyoming/natrona-county