County annual report · FIPS 46102
2020 Oglala Lakota County, SD Power Outage Report
In 2020, customers in Oglala Lakota County, SD went without power for an average of 0.9 hours, a total of 3,830 customer-hours (South Dakota average 4.6 hours). That ranks 47th worst of 62 South Dakota counties and 2690th of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Oglala Lakota County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 30, 2020 08:45 | July 30, 2020 11:00 | 2h 15m | 907 | 1,591 |
| 2 | June 7, 2020 13:15 | June 7, 2020 17:15 | 4h | 58 | 125 |
| 3 | June 7, 2020 01:15 | June 7, 2020 11:45 | 10h 30m | 55 | 538 |
| 4 | December 23, 2020 21:30 | December 24, 2020 02:00 | 4h 30m | 30 | 135 |
| 5 | September 14, 2020 20:15 | September 30, 2020 20:15 | 16d | 29 | 1,191 |
| 6 | February 7, 2020 16:30 | February 7, 2020 17:45 | 1h 15m | 6 | 8 |
| 7 | June 18, 2020 05:00 | June 18, 2020 08:00 | 3h | 6 | 17 |
| 8 | March 16, 2020 19:30 | March 16, 2020 20:30 | 1h | 5 | 5 |
| 9 | June 13, 2020 16:45 | June 13, 2020 20:30 | 3h 45m | 4 | 15 |
| 10 | July 20, 2020 21:00 | July 20, 2020 22:00 | 1h | 4 | 4 |
Outage episodes by size in 2020: 1 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 2020, 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 | 2020 | 2.0 hrs | 0.97 | 80 min | 0.78 |
| Black Hills Electric Coop, Inc | 2020 | 3.7 hrs | 1.16 | 3.7 hrs | 1.16 |
| West River Electric Assn Inc | 2020 | 28 min | 0.36 | 28 min | 0.36 |
| 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 79% of South Dakota's customers in 2020; 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, 2020, 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/2020/south-dakota/oglala-lakota-county