County annual report · FIPS 46051
2024 Grant County, SD Power Outage Report
In 2024, customers in Grant County, SD went without power for an average of 2.5 hours, a total of 7,676 customer-hours (South Dakota average 2.3 hours). That ranks 26th worst of 65 South Dakota counties and 2277th 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 Grant 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 | August 21, 2024 13:45 | August 21, 2024 18:15 | 4h 30m | 1,674 | 1,227 |
| 2 | April 24, 2024 10:30 | April 24, 2024 11:30 | 1h | 438 | 321 |
| 3 | August 3, 2024 22:30 | August 3, 2024 23:30 | 1h | 204 | 153 |
| 4 | July 16, 2024 13:00 | July 16, 2024 14:30 | 1h 30m | 189 | 121 |
| 5 | February 3, 2024 21:45 | February 5, 2024 14:00 | 1d 16h | 172 | 1,292 |
| 6 | November 20, 2024 09:45 | November 20, 2024 13:00 | 3h 15m | 124 | 402 |
| 7 | July 18, 2024 14:15 | July 18, 2024 14:45 | 30m | 107 | 54 |
| 8 | July 28, 2024 14:30 | July 28, 2024 15:15 | 45m | 107 | 80 |
| 9 | August 5, 2024 13:30 | August 5, 2024 17:30 | 4h | 106 | 118 |
| 10 | December 9, 2024 15:45 | December 9, 2024 18:30 | 2h 45m | 75 | 95 |
Outage episodes by size in 2024: 9 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 Grant 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 |
| H-D Electric Coop Inc | 2018 | 2.6 hrs | 1.52 | 1.6 hrs | 1.14 |
| Whetstone Valley Elec Coop Inc | 2018 | 73 min | 0.64 | 42 min | 0.43 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Codington-Clark Elec Coop, Inc | - | - | - | - | - |
| City of Big Stone City - (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 ÷ 3,124 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. Grant County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Grant 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/grant-county