County annual report · FIPS 46051
2020 Grant County, SD Power Outage Report
In 2020, customers in Grant County, SD went without power for an average of 0.5 hours, a total of 1,585 customer-hours (South Dakota average 4.6 hours). That ranks 54th worst of 62 South Dakota counties and 2822nd of 3,019 nationally.
Compared with SD, the US and 2019
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in Grant County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 27, 2020 13:30 | May 27, 2020 14:00 | 30m | 725 | 182 |
| 2 | September 3, 2020 14:00 | September 3, 2020 18:45 | 4h 45m | 69 | 311 |
| 3 | July 23, 2020 21:00 | July 24, 2020 13:15 | 16h 15m | 53 | 285 |
| 4 | May 8, 2020 18:15 | May 8, 2020 19:15 | 1h | 50 | 50 |
| 5 | June 16, 2020 20:30 | June 16, 2020 21:15 | 45m | 27 | 14 |
| 6 | June 8, 2020 19:45 | June 9, 2020 15:30 | 19h 45m | 19 | 371 |
| 7 | January 15, 2020 14:30 | January 15, 2020 14:45 | 15m | 18 | 5 |
| 8 | January 31, 2020 18:00 | January 31, 2020 20:45 | 2h 45m | 18 | 16 |
| 9 | November 5, 2020 18:30 | November 5, 2020 19:30 | 1h | 17 | 17 |
| 10 | March 5, 2020 13:45 | March 5, 2020 14:15 | 30m | 16 | 8 |
Outage episodes by size in 2020: 1 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 2020, 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 | 2020 | 1.6 hrs | 1.40 | 1.6 hrs | 1.40 |
| 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 79% of South Dakota's customers in 2020; 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, 2020, 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/2020/south-dakota/grant-county