County annual report · FIPS 46037
2024 Day County, SD Power Outage Report
In 2024, customers in Day County, SD went without power for an average of 5.7 hours, a total of 23K customer-hours (South Dakota average 2.3 hours). That ranks 9th worst of 65 South Dakota counties and 1464th of 2,990 nationally.
Compared with SD, the US and 2023
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Day County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 18, 2024 20:45 | September 19, 2024 05:00 | 8h 15m | 971 | 3,059 |
| 2 | May 7, 2024 01:30 | May 7, 2024 02:30 | 1h | 578 | 467 |
| 3 | June 7, 2024 19:00 | June 8, 2024 05:00 | 10h | 496 | 4,861 |
| 4 | June 8, 2024 23:45 | June 9, 2024 05:15 | 5h 30m | 445 | 1,889 |
| 5 | October 8, 2024 08:00 | October 8, 2024 11:45 | 3h 45m | 331 | 825 |
| 6 | October 22, 2024 11:15 | October 22, 2024 13:00 | 1h 45m | 330 | 578 |
| 7 | October 23, 2024 12:15 | October 23, 2024 13:15 | 1h | 330 | 330 |
| 8 | October 23, 2024 14:00 | October 23, 2024 15:00 | 1h | 330 | 330 |
| 9 | October 25, 2024 13:30 | October 25, 2024 15:30 | 2h | 330 | 660 |
| 10 | October 30, 2024 15:15 | October 30, 2024 17:45 | 2h 30m | 330 | 251 |
Outage episodes by size in 2024: 20 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 2024, 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 | 2024 | 2.6 hrs | 1.37 | 1.9 hrs | 1.09 |
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| NorthWestern Energy - (SD) | 2024 | 76 min | 0.70 | 66 min | 0.65 |
| Northern Electric Coop, Inc | 2024 | 50 min | 0.67 | 50 min | 0.67 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| 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 n/a of South Dakota's customers in 2024; 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, 2024, 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/2024/south-dakota/day-county