County annual report · FIPS 56033
2024 Sheridan County, WY Power Outage Report
In 2024, customers in Sheridan County, WY went without power for an average of 3.0 hours, a total of 53K customer-hours (Wyoming average 2.4 hours). That ranks 7th worst of 20 Wyoming counties and 2100th of 2,990 nationally.
Compared with WY, the US and 2023
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Sheridan County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 11, 2024 21:45 | September 23, 2024 17:15 | 11d 19h | 985 | 8,122 |
| 2 | November 19, 2024 07:45 | November 19, 2024 09:15 | 1h 30m | 587 | 191 |
| 3 | July 24, 2024 20:15 | July 26, 2024 00:00 | 1d 3h | 493 | 1,268 |
| 4 | April 6, 2024 17:30 | April 6, 2024 19:00 | 1h 30m | 430 | 433 |
| 5 | June 17, 2024 13:30 | June 17, 2024 16:30 | 3h | 379 | 587 |
| 6 | January 5, 2024 17:30 | January 5, 2024 20:15 | 2h 45m | 376 | 648 |
| 7 | June 6, 2024 18:15 | June 6, 2024 19:45 | 1h 30m | 364 | 273 |
| 8 | June 7, 2024 13:45 | June 7, 2024 16:15 | 2h 30m | 364 | 380 |
| 9 | June 10, 2024 16:45 | June 10, 2024 17:15 | 30m | 364 | 182 |
| 10 | July 17, 2024 22:30 | July 17, 2024 23:30 | 1h | 364 | 364 |
Outage episodes by size in 2024: 26 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 Sheridan County reported on EIA Form 861 for 2024, 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Powder River Energy Corp | 2024 | 8.3 hrs | 2.88 | 4.9 hrs | 2.24 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Big Horn County Elec Coop, 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 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 17,618 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. Sheridan County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sheridan County, WY annual power outage report, 2024, 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/2024/wyoming/sheridan-county