County annual report · FIPS 46051
2019 Grant County, SD Power Outage Report
In 2019, customers in Grant County, SD went without power for an average of 0.2 hours, a total of 729 customer-hours (South Dakota average 3.8 hours). That ranks 42nd worst of 58 South Dakota counties and 2763rd of 2,945 nationally.
Compared with SD, the US
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Grant County, 2019
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 30, 2019 18:30 | September 30, 2019 19:30 | 1h | 32 | 17 |
| 2 | September 25, 2019 17:30 | September 27, 2019 19:45 | 2d 2h | 22 | 160 |
| 3 | December 29, 2019 15:00 | December 29, 2019 16:00 | 1h | 22 | 20 |
| 4 | July 24, 2019 16:30 | July 24, 2019 21:30 | 5h | 21 | 24 |
| 5 | December 29, 2019 17:30 | December 29, 2019 20:30 | 3h | 13 | 15 |
| 6 | August 30, 2019 14:45 | August 30, 2019 17:45 | 3h | 5 | 13 |
| 7 | November 27, 2019 17:45 | November 27, 2019 19:15 | 1h 30m | 3 | 5 |
| 8 | September 30, 2019 13:00 | September 30, 2019 13:45 | 45m | 2 | 2 |
| 9 | October 7, 2019 17:15 | October 10, 2019 14:15 | 2d 21h | 2 | 134 |
| 10 | October 24, 2019 20:00 | November 7, 2019 14:00 | 13d 18h | 2 | 330 |
Outage episodes by size in 2019: 0 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 2019, 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 | 2018 | 1.8 hrs | 1.30 | 1.7 hrs | 1.23 |
| 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 87% of South Dakota's customers in 2019; 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, 2019, 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/2019/south-dakota/grant-county