County annual report · FIPS 56037
2021 Sweetwater County, WY Power Outage Report
In 2021, customers in Sweetwater County, WY went without power for an average of 2.4 hours, a total of 61K customer-hours (Wyoming average 2.2 hours). That ranks 10th worst of 20 Wyoming counties and 2072nd 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 Sweetwater 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 | February 7, 2021 01:45 | February 7, 2021 07:45 | 6h | 5,058 | 16K |
| 2 | August 26, 2021 02:00 | August 26, 2021 10:45 | 8h 45m | 2,477 | 1,056 |
| 3 | June 10, 2021 11:15 | June 10, 2021 13:00 | 1h 45m | 1,948 | 977 |
| 4 | May 24, 2021 21:30 | May 25, 2021 00:15 | 2h 45m | 1,548 | 1,550 |
| 5 | December 8, 2021 09:15 | December 8, 2021 13:00 | 3h 45m | 1,419 | 2,666 |
| 6 | July 11, 2021 13:30 | July 11, 2021 20:30 | 7h | 1,291 | 7,516 |
| 7 | July 8, 2021 07:30 | July 8, 2021 11:45 | 4h 15m | 1,281 | 4,500 |
| 8 | September 13, 2021 07:30 | September 13, 2021 20:45 | 13h 15m | 1,035 | 1,166 |
| 9 | May 11, 2021 01:45 | May 11, 2021 17:00 | 15h 15m | 406 | 1,418 |
| 10 | July 9, 2021 13:45 | July 10, 2021 05:45 | 16h | 387 | 2,414 |
Outage episodes by size in 2021: 30 reached 100+ customers, 8 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 Sweetwater 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 | - | - | - | - | - |
| Bridger Valley Elec Assn, 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 ÷ 25,475 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. Sweetwater County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sweetwater 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/sweetwater-county