County annual report · FIPS 56033
2023 Sheridan County, WY Power Outage Report
In 2023, customers in Sheridan County, WY went without power for an average of 1.9 hours, a total of 34K customer-hours (Wyoming average 2.0 hours). That ranks 12th worst of 20 Wyoming counties and 2308th of 2,977 nationally.
Compared with WY, the US and 2022
Coverage line is EAGLE-I's share of Wyoming customers tracked each year.
Biggest outages in Sheridan County, 2023
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 16, 2023 03:15 | February 16, 2023 10:00 | 6h 45m | 3,907 | 9,753 |
| 2 | September 26, 2023 20:30 | September 27, 2023 01:15 | 4h 45m | 3,176 | 1,829 |
| 3 | August 2, 2023 05:00 | August 2, 2023 11:15 | 6h 15m | 809 | 4,607 |
| 4 | June 15, 2023 11:45 | June 15, 2023 18:45 | 7h | 587 | 1,909 |
| 5 | October 20, 2023 04:00 | October 20, 2023 08:30 | 4h 30m | 542 | 2,188 |
| 6 | September 1, 2023 05:15 | September 1, 2023 07:45 | 2h 30m | 491 | 976 |
| 7 | February 3, 2023 23:15 | February 3, 2023 23:45 | 30m | 468 | 120 |
| 8 | September 4, 2023 20:30 | September 7, 2023 19:30 | 2d 23h | 467 | 2,196 |
| 9 | August 10, 2023 05:15 | August 10, 2023 12:15 | 7h | 459 | 1,977 |
| 10 | June 10, 2023 01:30 | June 10, 2023 06:00 | 4h 30m | 446 | 654 |
Outage episodes by size in 2023: 23 reached 100+ customers, 2 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 2023, 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 |
|---|---|---|---|---|---|
| Powder River Energy Corp | 2023 | 3.4 hrs | 1.40 | 3.4 hrs | 1.40 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 2023; 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, 2023, 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/2023/wyoming/sheridan-county