County annual report · FIPS 56035
2025 Sublette County, WY Power Outage Report
In 2025, customers in Sublette County, WY went without power for an average of 5.3 hours, a total of 27K customer-hours (Wyoming average 3.8 hours). That ranks 8th worst of 20 Wyoming counties and 1423rd 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 Sublette 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 | December 27, 2025 22:15 | December 28, 2025 19:30 | 21h 15m | 572 | 8,537 |
| 2 | March 2, 2025 23:15 | March 3, 2025 17:00 | 17h 45m | 561 | 5,132 |
| 3 | July 26, 2025 16:15 | July 26, 2025 20:45 | 4h 30m | 441 | 1,916 |
| 4 | April 26, 2025 02:15 | April 26, 2025 06:15 | 4h | 219 | 386 |
| 5 | February 3, 2025 04:45 | February 3, 2025 10:45 | 6h | 201 | 1,006 |
| 6 | August 15, 2025 19:15 | August 15, 2025 22:00 | 2h 45m | 188 | 273 |
| 7 | June 30, 2025 14:15 | June 30, 2025 15:45 | 1h 30m | 187 | 281 |
| 8 | January 31, 2025 16:30 | January 31, 2025 20:00 | 3h 30m | 155 | 543 |
| 9 | December 17, 2025 19:30 | December 19, 2025 21:15 | 2d 1h | 142 | 3,602 |
| 10 | July 4, 2025 04:15 | July 4, 2025 05:15 | 1h | 138 | 105 |
Outage episodes by size in 2025: 15 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 Sublette 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 |
| Lower Valley Energy 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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 5,123 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. Sublette County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sublette 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/sublette-county