County annual report · FIPS 46102
2025 Oglala Lakota County, SD Power Outage Report
In 2025, customers in Oglala Lakota County, SD went without power for an average of 2.1 hours, a total of 8,773 customer-hours (South Dakota average 6.5 hours). That ranks 39th worst of 65 South Dakota counties and 2384th 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 Oglala Lakota 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 | June 1, 2025 02:30 | June 1, 2025 06:30 | 4h | 816 | 3,205 |
| 2 | April 26, 2025 18:45 | April 26, 2025 20:00 | 1h 15m | 806 | 1,007 |
| 3 | June 14, 2025 02:00 | June 14, 2025 05:30 | 3h 30m | 549 | 1,510 |
| 4 | May 21, 2025 06:15 | May 21, 2025 10:00 | 3h 45m | 336 | 933 |
| 5 | November 20, 2025 21:15 | November 21, 2025 00:00 | 2h 45m | 95 | 261 |
| 6 | January 9, 2025 11:45 | January 9, 2025 15:30 | 3h 45m | 74 | 276 |
| 7 | December 18, 2025 11:45 | December 20, 2025 18:15 | 2d 6h | 73 | 694 |
| 8 | July 6, 2025 12:15 | July 6, 2025 16:00 | 3h 45m | 59 | 134 |
| 9 | May 26, 2025 20:15 | May 26, 2025 21:15 | 1h | 47 | 47 |
| 10 | November 26, 2025 11:45 | November 26, 2025 14:15 | 2h 30m | 46 | 115 |
Outage episodes by size in 2025: 4 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 Oglala Lakota 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 |
|---|---|---|---|---|---|
| Nebraska Public Power District | 2024 | 74 min | 0.74 | 74 min | 0.74 |
| Black Hills Electric Coop, Inc | 2024 | 3.8 hrs | 1.03 | 1.7 hrs | 0.77 |
| West River Electric Assn Inc | 2024 | 44 min | 0.53 | 44 min | 0.53 |
| LaCreek Electric 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 n/a of South Dakota's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,164 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. Oglala Lakota County has data for 2018–2025.
Cite this report
MassOutage (massoutage.com), Oglala Lakota 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/oglala-lakota-county