County annual report · FIPS 19161
2025 Sac County, IA Power Outage Report
In 2025, customers in Sac County, IA went without power for an average of 17.8 hours, a total of 69K customer-hours (Iowa average 2.9 hours). That ranks 2nd worst of 99 Iowa counties and 422nd of 3,000 nationally.
Compared with IA, the US and 2024
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Sac County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 19, 2025 11:45 | March 20, 2025 20:30 | 1d 8h | 3,463 | 39K |
| 2 | May 19, 2025 12:30 | May 19, 2025 17:00 | 4h 30m | 1,296 | 4,953 |
| 3 | June 5, 2025 20:00 | June 5, 2025 21:00 | 1h | 988 | 812 |
| 4 | March 14, 2025 23:30 | March 15, 2025 07:15 | 7h 45m | 796 | 1,502 |
| 5 | March 5, 2025 02:15 | March 6, 2025 03:00 | 1d | 761 | 11K |
| 6 | January 30, 2025 09:15 | January 30, 2025 14:30 | 5h 15m | 520 | 2,242 |
| 7 | April 18, 2025 06:30 | April 19, 2025 04:30 | 22h | 498 | 6,375 |
| 8 | July 16, 2025 12:15 | July 16, 2025 14:15 | 2h | 481 | 318 |
| 9 | August 17, 2025 22:15 | August 17, 2025 23:45 | 1h 30m | 440 | 660 |
| 10 | July 28, 2025 07:00 | July 28, 2025 09:00 | 2h | 190 | 380 |
Outage episodes by size in 2025: 12 reached 100+ customers, 2 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 Sac 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 |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| Iowa Lakes Electric Coop | 2024 | 45 min | 0.48 | 45 min | 0.48 |
| Western Iowa Power Coop | 2018 | 47 min | 0.76 | 47 min | 0.76 |
| North West Rural Electric Coop | - | - | - | - | - |
| Raccoon Valley Electric Cooperative | - | - | - | - | - |
| Calhoun County Elec Coop Assn | - | - | - | - | - |
| City of Auburn - (IA) | - | - | - | - | - |
| City of Lake View - (IA) | - | - | - | - | - |
| City of Wall Lake - (IA) | - | - | - | - | - |
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 Iowa's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 3,895 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. Sac County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sac County, IA 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/iowa/sac-county