County annual report · FIPS 19161
2021 Sac County, IA Power Outage Report
In 2021, customers in Sac County, IA went without power for an average of 8.5 hours, a total of 33K customer-hours (Iowa average 2.7 hours). That ranks 16th worst of 99 Iowa counties and 891st of 2,974 nationally.
Compared with IA, the US and 2020
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Sac County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 10, 2021 20:30 | December 11, 2021 12:45 | 16h 15m | 2,274 | 14K |
| 2 | December 15, 2021 23:15 | December 17, 2021 11:15 | 1d 12h | 1,818 | 4,349 |
| 3 | June 1, 2021 06:15 | June 1, 2021 09:45 | 3h 30m | 1,573 | 1,001 |
| 4 | June 17, 2021 02:45 | June 18, 2021 02:15 | 23h 30m | 1,210 | 7,239 |
| 5 | September 28, 2021 04:45 | September 28, 2021 10:15 | 5h 30m | 760 | 3,971 |
| 6 | June 24, 2021 14:45 | June 24, 2021 22:45 | 8h | 530 | 554 |
| 7 | January 15, 2021 19:45 | January 15, 2021 22:45 | 3h | 189 | 376 |
| 8 | July 5, 2021 17:30 | July 5, 2021 19:45 | 2h 15m | 158 | 235 |
| 9 | December 14, 2021 17:15 | December 14, 2021 18:15 | 1h | 155 | 154 |
| 10 | February 16, 2021 13:00 | February 16, 2021 20:15 | 7h 15m | 97 | 152 |
Outage episodes by size in 2021: 9 reached 100+ customers, 4 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 2021, 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 | 2021 | 1.9 hrs | 1.04 | 75 min | 0.74 |
| Iowa Lakes Electric Coop | 2021 | 75 min | 0.84 | 65 min | 0.80 |
| 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 91% of Iowa's customers in 2021; 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, 2021, 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/2021/iowa/sac-county