County annual report · FIPS 46102
2021 Oglala Lakota County, SD Power Outage Report
In 2021, customers in Oglala Lakota County, SD went without power for an average of 0.9 hours, a total of 3,784 customer-hours (South Dakota average 3.4 hours). That ranks 53rd worst of 61 South Dakota counties and 2700th of 2,974 nationally.
Compared with SD, the US and 2020
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Oglala Lakota County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 14, 2021 19:15 | March 15, 2021 18:30 | 23h 15m | 521 | 1,787 |
| 2 | July 27, 2021 12:15 | July 27, 2021 13:15 | 1h | 266 | 266 |
| 3 | June 21, 2021 05:15 | June 21, 2021 08:30 | 3h 15m | 265 | 861 |
| 4 | October 17, 2021 03:45 | October 17, 2021 07:45 | 4h | 82 | 324 |
| 5 | March 13, 2021 22:15 | March 14, 2021 01:15 | 3h | 68 | 140 |
| 6 | August 4, 2021 22:15 | August 5, 2021 01:30 | 3h 15m | 21 | 59 |
| 7 | February 3, 2021 19:15 | February 3, 2021 22:45 | 3h 30m | 13 | 46 |
| 8 | March 15, 2021 21:00 | March 16, 2021 00:30 | 3h 30m | 8 | 28 |
| 9 | February 7, 2021 00:45 | February 7, 2021 04:45 | 4h | 7 | 21 |
| 10 | September 1, 2021 18:15 | September 1, 2021 23:00 | 4h 45m | 7 | 33 |
Outage episodes by size in 2021: 3 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 2021, 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 | 2021 | 4.0 hrs | 1.14 | 71 min | 0.66 |
| Black Hills Electric Coop, Inc | 2021 | 6.6 hrs | 1.67 | 2.2 hrs | 1.02 |
| West River Electric Assn Inc | 2021 | 54 min | 0.72 | 54 min | 0.72 |
| 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 2021; 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, 2021, 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/2021/south-dakota/oglala-lakota-county