County annual report · FIPS 56025
2025 Natrona County, WY Power Outage Report
In 2025, customers in Natrona County, WY went without power for an average of 3.8 hours, a total of 181K customer-hours (Wyoming average 3.8 hours). That ranks 11th worst of 20 Wyoming counties and 1827th of 3,000 nationally.
Compared with WY, the US and 2024
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Natrona County, 2025
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 13, 2025 16:15 | November 14, 2025 11:15 | 19h | 43,178 | 88K |
| 2 | July 28, 2025 14:30 | July 28, 2025 23:00 | 8h 30m | 7,603 | 22K |
| 3 | May 30, 2025 05:30 | May 30, 2025 07:30 | 2h | 4,636 | 6,955 |
| 4 | December 16, 2025 16:30 | December 16, 2025 19:30 | 3h | 4,112 | 3,562 |
| 5 | August 20, 2025 22:15 | August 21, 2025 04:45 | 6h 30m | 2,691 | 8,453 |
| 6 | August 14, 2025 11:30 | August 14, 2025 21:15 | 9h 45m | 2,581 | 1,738 |
| 7 | August 17, 2025 02:30 | August 17, 2025 03:00 | 30m | 2,580 | 646 |
| 8 | August 24, 2025 09:30 | August 24, 2025 14:45 | 5h 15m | 2,535 | 3,209 |
| 9 | August 28, 2025 15:00 | August 28, 2025 16:45 | 1h 45m | 2,339 | 678 |
| 10 | August 23, 2025 15:00 | August 23, 2025 19:30 | 4h 30m | 2,164 | 1,924 |
Outage episodes by size in 2025: 43 reached 100+ customers, 13 reached 1,000+ customers, 1 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 2025, 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 | 2024 | 4.6 hrs | 1.67 | 2.0 hrs | 1.11 |
| High Plains Power Inc | 2024 | 5.2 hrs | - | 5.2 hrs | - |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
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 2025; 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, 2025, 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/2025/wyoming/natrona-county