County annual report · FIPS 46105
2021 Perkins County, SD Power Outage Report
In 2021, customers in Perkins County, SD went without power for an average of 24.0 hours, a total of 21K customer-hours (South Dakota average 3.4 hours). That ranks 5th worst of 61 South Dakota counties and 353rd 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 Perkins 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 | January 14, 2021 19:15 | January 18, 2021 14:30 | 3d 19h | 1,988 | 3,089 |
| 2 | December 15, 2021 21:30 | December 15, 2021 22:45 | 1h 15m | 294 | 216 |
| 3 | January 19, 2021 15:30 | January 19, 2021 16:30 | 1h | 292 | 292 |
| 4 | January 19, 2021 09:00 | January 19, 2021 09:30 | 30m | 260 | 130 |
| 5 | September 19, 2021 20:15 | September 20, 2021 00:30 | 4h 15m | 258 | 1,097 |
| 6 | June 8, 2021 22:00 | June 10, 2021 20:15 | 1d 22h | 231 | 3,260 |
| 7 | January 26, 2021 16:15 | January 26, 2021 17:00 | 45m | 162 | 122 |
| 8 | August 31, 2021 01:30 | August 31, 2021 23:15 | 21h 45m | 160 | 1,567 |
| 9 | April 27, 2021 14:45 | April 28, 2021 14:45 | 1d | 143 | 747 |
| 10 | January 14, 2021 15:45 | January 14, 2021 17:00 | 1h 15m | 138 | 122 |
Outage episodes by size in 2021: 16 reached 100+ customers, 1 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 Perkins 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Grand Electric Coop, 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 ÷ 890 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. Perkins County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Perkins 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/). https://massoutage.com/reports/2021/south-dakota/perkins-county