County annual report · FIPS 46063
2025 Harding County, SD Power Outage Report
In 2025, customers in Harding County, SD went without power for an average of 48.8 hours, a total of 20K customer-hours (South Dakota average 6.5 hours). That ranks 2nd worst of 65 South Dakota counties and 88th of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Harding County, 2025
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 4, 2025 14:15 | September 4, 2025 15:15 | 1h | 1,041 | 1,041 |
| 2 | March 24, 2025 20:00 | March 24, 2025 20:45 | 45m | 429 | 158 |
| 3 | December 18, 2025 05:00 | December 18, 2025 21:15 | 16h 15m | 405 | 1,963 |
| 4 | August 13, 2025 23:45 | August 14, 2025 13:45 | 14h | 359 | 474 |
| 5 | June 21, 2025 00:15 | June 25, 2025 14:15 | 4d 14h | 316 | 2,873 |
| 6 | July 15, 2025 21:15 | July 18, 2025 14:00 | 2d 16h | 291 | 610 |
| 7 | December 3, 2025 20:30 | December 3, 2025 23:30 | 3h | 289 | 867 |
| 8 | June 8, 2025 16:00 | June 9, 2025 03:45 | 11h 45m | 213 | 2,450 |
| 9 | May 7, 2025 00:45 | May 7, 2025 02:00 | 1h 15m | 156 | 130 |
| 10 | March 18, 2025 06:00 | March 18, 2025 18:00 | 12h | 142 | 238 |
Outage episodes by size in 2025: 18 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 Harding County reported on EIA Form 861 for 2025, 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Grand Electric Coop, Inc | - | - | - | - | - |
| Southeast 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 n/a of South Dakota's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 403 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. Harding County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Harding County, SD annual power outage report, 2025, 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/2025/south-dakota/harding-county