County annual report · FIPS 46031
2020 Corson County, SD Power Outage Report
In 2020, customers in Corson County, SD went without power for an average of 0.5 hours, a total of 937 customer-hours (South Dakota average 4.6 hours). That ranks 55th worst of 62 South Dakota counties and 2831st 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 Corson County, 2020
The 8 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 19, 2020 16:45 | June 19, 2020 17:00 | 15m | 139 | 35 |
| 2 | June 19, 2020 20:15 | June 19, 2020 20:30 | 15m | 139 | 35 |
| 3 | August 14, 2020 09:45 | August 14, 2020 12:00 | 2h 15m | 139 | 307 |
| 4 | August 6, 2020 15:00 | August 6, 2020 19:00 | 4h | 131 | 524 |
| 5 | July 22, 2020 18:15 | July 22, 2020 22:00 | 3h 45m | 5 | 18 |
| 6 | August 15, 2020 15:15 | August 15, 2020 16:45 | 1h 30m | 5 | 8 |
| 7 | September 15, 2020 10:15 | September 15, 2020 12:15 | 2h | 5 | 10 |
| 8 | September 30, 2020 01:30 | September 30, 2020 03:00 | 1h 30m | 1 | 2 |
Outage episodes by size in 2020: 4 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 Corson 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | - | - | - | - | - |
| Grand Electric Coop, Inc | - | - | - | - | - |
| Moreau-Grand Electric Coop Inc | - | - | - | - | - |
| City of McLaughlin - (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 ÷ 1,975 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. Corson County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Corson 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/). https://massoutage.com/reports/2020/south-dakota/corson-county