County annual report · FIPS 46102
2018 Oglala Lakota County, SD Power Outage Report
In 2018, customers in Oglala Lakota County, SD went without power for an average of 0.0 hours, a total of 206 customer-hours (South Dakota average 1.1 hours). That ranks 25th worst of 30 South Dakota counties and 2698th of 2,798 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Oglala Lakota County, 2018
The 6 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 5, 2018 17:30 | March 5, 2018 23:00 | 5h 30m | 22 | 74 |
| 2 | September 20, 2018 14:30 | September 20, 2018 17:00 | 2h 30m | 22 | 55 |
| 3 | April 11, 2018 15:15 | April 13, 2018 12:45 | 1d 21h | 7 | 59 |
| 4 | March 30, 2018 21:00 | March 30, 2018 23:15 | 2h 15m | 1 | 2 |
| 5 | April 18, 2018 14:30 | April 18, 2018 22:00 | 7h 30m | 1 | 8 |
| 6 | July 4, 2018 23:30 | July 5, 2018 08:15 | 8h 45m | 1 | 9 |
Outage episodes by size in 2018: 0 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 2018, 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 | 2018 | 2.6 hrs | 0.74 | 49 min | 0.60 |
| Black Hills Electric Coop, Inc | 2018 | 68 min | 0.92 | 68 min | 0.92 |
| LaCreek Electric Assn, Inc | - | - | - | - | - |
| West River 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 46% of South Dakota's customers in 2018; 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, 2018, 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/2018/south-dakota/oglala-lakota-county