County annual report · FIPS 46117
2021 Stanley County, SD Power Outage Report
In 2021, customers in Stanley County, SD went without power for an average of 2.0 hours, a total of 5,159 customer-hours (South Dakota average 3.4 hours). That ranks 41st worst of 61 South Dakota counties and 2204th 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 Stanley 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 | August 17, 2021 21:30 | August 17, 2021 22:30 | 1h | 484 | 338 |
| 2 | February 2, 2021 15:45 | February 2, 2021 16:30 | 45m | 478 | 245 |
| 3 | February 2, 2021 19:00 | February 2, 2021 19:45 | 45m | 477 | 358 |
| 4 | June 9, 2021 07:45 | June 9, 2021 14:15 | 6h 30m | 333 | 1,105 |
| 5 | June 12, 2021 03:15 | June 12, 2021 03:30 | 15m | 152 | 38 |
| 6 | August 31, 2021 05:15 | August 31, 2021 13:30 | 8h 15m | 131 | 1,073 |
| 7 | October 13, 2021 21:45 | October 14, 2021 00:45 | 3h | 130 | 294 |
| 8 | February 3, 2021 17:00 | February 3, 2021 21:15 | 4h 15m | 84 | 204 |
| 9 | April 22, 2021 17:15 | April 22, 2021 19:15 | 2h | 74 | 94 |
| 10 | April 2, 2021 15:15 | April 2, 2021 18:15 | 3h | 55 | 160 |
Outage episodes by size in 2021: 7 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 Stanley 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 |
|---|---|---|---|---|---|
| West Central Electric Coop Inc - (SD) | 2018 | 3.7 hrs | 1.25 | 1.5 hrs | 1.25 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| City of Fort Pierre - (SD) | - | - | - | - | - |
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 ÷ 2,520 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. Stanley County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Stanley 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/stanley-county