County annual report · FIPS 46051
2023 Grant County, SD Power Outage Report
In 2023, customers in Grant County, SD went without power for an average of 1.0 hours, a total of 3,059 customer-hours (South Dakota average 2.3 hours). That ranks 48th worst of 61 South Dakota counties and 2685th of 2,977 nationally.
Compared with SD, the US and 2022
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Grant County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 4, 2023 03:45 | October 4, 2023 08:45 | 5h | 679 | 447 |
| 2 | December 17, 2023 14:45 | December 17, 2023 16:00 | 1h 15m | 518 | 618 |
| 3 | November 12, 2023 20:30 | November 12, 2023 22:00 | 1h 30m | 187 | 281 |
| 4 | May 20, 2023 19:00 | May 20, 2023 21:15 | 2h 15m | 105 | 185 |
| 5 | October 13, 2023 22:30 | October 13, 2023 23:15 | 45m | 105 | 79 |
| 6 | May 22, 2023 20:00 | May 22, 2023 20:30 | 30m | 62 | 31 |
| 7 | August 17, 2023 18:00 | August 17, 2023 18:15 | 15m | 60 | 15 |
| 8 | September 29, 2023 14:15 | September 29, 2023 18:30 | 4h 15m | 31 | 12 |
| 9 | May 16, 2023 14:45 | May 16, 2023 15:00 | 15m | 29 | 7 |
| 10 | May 17, 2023 13:15 | May 17, 2023 18:00 | 4h 45m | 29 | 138 |
Outage episodes by size in 2023: 5 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 Grant County reported on EIA Form 861 for 2023, 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 | 2023 | 2.4 hrs | 1.78 | 1.9 hrs | 1.68 |
| 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 | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 2023; 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, 2023, 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/2023/south-dakota/grant-county