County annual report · FIPS 46035
2021 Davison County, SD Power Outage Report
In 2021, customers in Davison County, SD went without power for an average of 1.3 hours, a total of 15K customer-hours (South Dakota average 3.4 hours). That ranks 49th worst of 61 South Dakota counties and 2558th 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 Davison 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 15, 2021 06:45 | March 16, 2021 00:15 | 17h 30m | 2,581 | 4,063 |
| 2 | June 11, 2021 11:00 | June 11, 2021 15:00 | 4h | 737 | 1,293 |
| 3 | January 10, 2021 15:15 | January 10, 2021 16:15 | 1h | 687 | 687 |
| 4 | December 22, 2021 19:15 | December 23, 2021 00:15 | 5h | 550 | 1,581 |
| 5 | April 19, 2021 16:45 | April 19, 2021 22:15 | 5h 30m | 284 | 500 |
| 6 | September 29, 2021 22:15 | September 30, 2021 12:15 | 14h | 280 | 1,817 |
| 7 | February 16, 2021 14:30 | February 16, 2021 15:30 | 1h | 223 | 223 |
| 8 | June 23, 2021 22:15 | June 24, 2021 13:00 | 14h 45m | 215 | 390 |
| 9 | May 14, 2021 17:45 | May 14, 2021 23:00 | 5h 15m | 82 | 338 |
| 10 | December 29, 2021 20:30 | December 29, 2021 22:30 | 2h | 70 | 140 |
Outage episodes by size in 2021: 8 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 Davison 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 |
|---|---|---|---|---|---|
| NorthWestern Energy - (SD) | 2021 | 1.5 hrs | 0.95 | 81 min | 0.83 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| Central Electric Coop, Inc - (SD) | - | - | - | - | - |
| Douglas 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 ÷ 11,593 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. Davison County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Davison 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/davison-county