massoutage

County annual report · FIPS 46031

2019 Corson County, SD Power Outage Report

In 2019, customers in Corson County, SD went without power for an average of 0.0 hours, a total of 13 customer-hours (South Dakota average 3.8 hours). That ranks 55th worst of 58 South Dakota counties and 2898th of 2,945 nationally.

Summary data CSVJSON
Avg hrs / customer
0.0
1,975 customers
Customer-hours out
13
Peak customers out
46
Outages ≥1,000 out
0
0 of 10,000+ · 2 total
Longest outage
15m
began July 17, 2019
Rank in state
55th/58
2898th of 2,945 US

Compared with SD, the US and 2018

Corson County, SD average hours without power per customer compared with state and national averages, 2019Corson County 0.0 hours, South Dakota average 3.8 hours, US average 4.7 hours, Corson County, 2018 0.3 hoursCorson CountyCorson County0.0hSouth Dakota averageSouth Dakota average3.8hUS averageUS average4.7hCorson County, 2018Corson County, 20180.3h
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Average hours without power per customer in 2019; last bar is this county in 2018.

Month by month

CSVJSON
Corson County, SD customer-hours without power by month, 2019Jan 0, Feb 0, Mar 0, Apr 1, May 0, Jun 0, Jul 12, Aug 0, Sep 0, Oct 0, Nov 0, Dec 00510150Jan0Feb0Mar1Apr0May0Jun12Jul0Aug0Sep0Oct0Nov0Dec
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Customer-hours; July was the worst month.

Corson County year over year

CSVJSON
Corson County, SD: average hours without power per customer by year2015: no data; 2016: no data; 2017: 0.1h; 2018: 0.3h, coverage 46%; 2019: 0.0h, coverage 87%; 2020: 0.5h, coverage 79%; 2021: 0.2h, coverage 79%; 2022: 0.8h, coverage 89%; 2023: 0.0h; 2024: 2.8h; 2025: 2.3h01230%50%100%n/a2015n/a20160.1h20170.3h20180.0h20190.5h20200.2h20210.8h20220.0h20232.8h20242.3h2025
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Average hours without power per customer. Line: EAGLE-I coverage, share of customers tracked (right axis).

Coverage line is EAGLE-I's share of South Dakota customers tracked each year.

Biggest outages in Corson County, 2019

The 2 outage episodes with the most customers out at once. Times are UTC.

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1July 17, 2019 04:45July 17, 2019 05:0015m4612
2April 3, 2019 18:15April 3, 2019 18:3015m51

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 Corson County reported on EIA Form 861 for 2019, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI 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 87% of South Dakota's customers in 2019; 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, 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/). https://massoutage.com/reports/2019/south-dakota/corson-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Corson County by year:20252024202320222021202020182017
Live outages in Corson County2019 South Dakota report2019 US report