County annual report · FIPS 46063
2021 Harding County, SD Power Outage Report
In 2021, customers in Harding County, SD went without power for an average of 107.7 hours, a total of 43K customer-hours (South Dakota average 3.4 hours). That ranks 1st worst of 61 South Dakota counties and 68th 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 Harding 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 | January 14, 2021 21:45 | January 15, 2021 16:00 | 18h 15m | 1,783 | 1,079 |
| 2 | May 5, 2021 14:15 | May 10, 2021 22:00 | 5d 7h | 421 | 22K |
| 3 | December 2, 2021 16:00 | December 2, 2021 21:15 | 5h 15m | 299 | 636 |
| 4 | July 22, 2021 23:15 | July 26, 2021 13:15 | 3d 14h | 277 | 3,064 |
| 5 | January 17, 2021 18:30 | January 18, 2021 14:30 | 20h | 274 | 348 |
| 6 | June 13, 2021 14:00 | June 13, 2021 14:45 | 45m | 199 | 100 |
| 7 | January 31, 2021 06:00 | January 31, 2021 06:30 | 30m | 193 | 65 |
| 8 | October 13, 2021 05:00 | October 16, 2021 14:30 | 3d 9h | 170 | 1,085 |
| 9 | March 4, 2021 20:15 | March 4, 2021 20:45 | 30m | 157 | 51 |
| 10 | June 14, 2021 19:15 | June 14, 2021 21:45 | 2h 30m | 141 | 318 |
Outage episodes by size in 2021: 15 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 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 79% of South Dakota's customers in 2021; 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, 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/). https://massoutage.com/reports/2021/south-dakota/harding-county