County annual report · FIPS 46089
2025 McPherson County, SD Power Outage Report
In 2025, customers in McPherson County, SD went without power for an average of 1.3 hours, a total of 1,623 customer-hours (South Dakota average 6.5 hours). That ranks 49th worst of 65 South Dakota counties and 2667th of 3,000 nationally.
Compared with SD, the US and 2024
Coverage line is EAGLE-I's share of South Dakota customers tracked each year.
Biggest outages in McPherson County, 2025
The 8 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 11, 2025 22:45 | May 11, 2025 23:30 | 45m | 607 | 454 |
| 2 | December 18, 2025 12:45 | December 18, 2025 16:00 | 3h 15m | 322 | 1,015 |
| 3 | August 16, 2025 09:00 | August 16, 2025 09:15 | 15m | 15 | 4 |
| 4 | May 18, 2025 20:45 | May 18, 2025 23:00 | 2h 15m | 12 | 27 |
| 5 | August 9, 2025 19:15 | August 9, 2025 20:00 | 45m | 8 | 6 |
| 6 | August 27, 2025 02:45 | August 27, 2025 17:15 | 14h 30m | 7 | 102 |
| 7 | October 8, 2025 18:00 | October 8, 2025 19:30 | 1h 30m | 6 | 9 |
| 8 | January 31, 2025 18:00 | January 31, 2025 19:15 | 1h 15m | 5 | 6 |
Outage episodes by size in 2025: 2 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 McPherson County reported on EIA Form 861 for 2025, 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 | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Northern Electric Coop, Inc | 2024 | 50 min | 0.67 | 50 min | 0.67 |
| FEM Electric Assn, Inc | 2018 | 3.8 hrs | 2.21 | 3.8 hrs | 2.21 |
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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,223 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. McPherson County has data for 2017, 2019–2025.
Cite this report
MassOutage (massoutage.com), McPherson County, SD annual power outage report, 2025, 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/2025/south-dakota/mcpherson-county