County annual report · FIPS 46053
2025 Gregory County, SD Power Outage Report
In 2025, customers in Gregory County, SD went without power for an average of 1.9 hours, a total of 4,950 customer-hours (South Dakota average 6.5 hours). That ranks 44th worst of 65 South Dakota counties and 2473rd of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Gregory 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 | September 5, 2025 15:00 | September 5, 2025 15:15 | 15m | 790 | 198 |
| 2 | July 28, 2025 22:00 | July 30, 2025 17:45 | 1d 19h | 542 | 2,530 |
| 3 | May 9, 2025 13:30 | May 9, 2025 13:45 | 15m | 490 | 123 |
| 4 | May 15, 2025 13:00 | May 15, 2025 18:00 | 5h | 268 | 605 |
| 5 | August 29, 2025 23:45 | August 30, 2025 00:30 | 45m | 259 | 194 |
| 6 | September 23, 2025 14:00 | September 23, 2025 16:15 | 2h 15m | 159 | 358 |
| 7 | March 28, 2025 22:15 | March 29, 2025 02:00 | 3h 45m | 47 | 145 |
| 8 | August 12, 2025 00:15 | August 12, 2025 01:30 | 1h 15m | 41 | 42 |
| 9 | November 3, 2025 16:30 | November 3, 2025 17:45 | 1h 15m | 38 | 30 |
| 10 | December 3, 2025 19:30 | December 3, 2025 20:15 | 45m | 34 | 26 |
Outage episodes by size in 2025: 6 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 Gregory 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 |
|---|---|---|---|---|---|
| Rosebud Electric Coop Inc | 2024 | 1.9 hrs | 0.84 | 1.6 hrs | 0.76 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| City of Burke - (SD) | - | - | - | - | - |
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 South Dakota's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,673 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. Gregory County has data for 2022, 2024–2025.
Cite this report
MassOutage (massoutage.com), Gregory County, SD 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/south-dakota/gregory-county