County annual report · FIPS 56007
2021 Carbon County, WY Power Outage Report
In 2021, customers in Carbon County, WY went without power for an average of 1.5 hours, a total of 16K customer-hours (Wyoming average 2.2 hours). That ranks 14th worst of 20 Wyoming counties and 2471st 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 Carbon 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 | May 2, 2021 01:00 | May 2, 2021 09:15 | 8h 15m | 768 | 6,336 |
| 2 | July 20, 2021 20:15 | July 21, 2021 01:30 | 5h 15m | 768 | 1,678 |
| 3 | December 24, 2021 15:45 | December 24, 2021 21:00 | 5h 15m | 763 | 1,148 |
| 4 | October 12, 2021 13:45 | October 12, 2021 17:45 | 4h | 512 | 1,026 |
| 5 | July 6, 2021 00:30 | July 6, 2021 02:45 | 2h 15m | 293 | 234 |
| 6 | December 5, 2021 18:30 | December 5, 2021 20:45 | 2h 15m | 278 | 465 |
| 7 | May 3, 2021 01:00 | May 3, 2021 01:45 | 45m | 263 | 185 |
| 8 | May 16, 2021 01:15 | May 16, 2021 02:45 | 1h 30m | 172 | 220 |
| 9 | November 9, 2021 16:00 | November 9, 2021 22:30 | 6h 30m | 109 | 708 |
| 10 | September 6, 2021 23:30 | September 7, 2021 10:00 | 10h 30m | 108 | 1,024 |
Outage episodes by size in 2021: 13 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 Carbon 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 |
| Yampa Valley Electric Assn Inc | 2021 | 1.7 hrs | 0.81 | 1.7 hrs | 0.81 |
| Carbon Power & Light, Inc | 2018 | 7.6 hrs | 1.56 | 2.5 hrs | 1.34 |
| 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 ÷ 10,767 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. Carbon County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Carbon 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/carbon-county