County annual report · FIPS 46037
2019 Day County, SD Power Outage Report
In 2019, customers in Day County, SD went without power for an average of 2.6 hours, a total of 11K customer-hours (South Dakota average 3.8 hours). That ranks 19th worst of 58 South Dakota counties and 1780th of 2,945 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Day County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 27, 2019 18:15 | December 30, 2019 22:15 | 3d 4h | 589 | 8,516 |
| 2 | July 8, 2019 17:00 | July 20, 2019 18:00 | 12d 1h | 317 | 502 |
| 3 | September 13, 2019 14:45 | September 13, 2019 16:30 | 1h 45m | 69 | 121 |
| 4 | October 13, 2019 15:00 | October 13, 2019 15:45 | 45m | 65 | 43 |
| 5 | October 14, 2019 13:30 | October 14, 2019 14:30 | 1h | 48 | 48 |
| 6 | December 26, 2019 18:00 | December 26, 2019 18:30 | 30m | 40 | 20 |
| 7 | October 21, 2019 17:45 | October 21, 2019 20:30 | 2h 45m | 38 | 105 |
| 8 | August 26, 2019 13:00 | August 26, 2019 19:15 | 6h 15m | 36 | 148 |
| 9 | September 26, 2019 05:45 | September 26, 2019 08:30 | 2h 45m | 36 | 89 |
| 10 | August 23, 2019 13:30 | August 23, 2019 16:00 | 2h 30m | 19 | 25 |
Outage episodes by size in 2019: 2 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 Day County reported on EIA Form 861 for 2019, 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 |
|---|---|---|---|---|---|
| Otter Tail Power Co | 2018 | 1.8 hrs | 1.30 | 1.7 hrs | 1.23 |
| NorthWestern Energy - (SD) | 2018 | 1.9 hrs | 1.24 | 1.6 hrs | 1.13 |
| Northern Electric Coop, Inc | 2018 | 3.3 hrs | 1.45 | 70 min | 1.25 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| Lake Region Electric Assn, Inc - (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 87% of South Dakota's customers in 2019; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,051 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. Day County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Day County, SD annual power outage report, 2019, 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/2019/south-dakota/day-county