County annual report · FIPS 19161
2018 Sac County, IA Power Outage Report
In 2018, customers in Sac County, IA went without power for an average of 1.8 hours, a total of 6,874 customer-hours (Iowa average 2.2 hours). That ranks 62nd worst of 99 Iowa counties and 1965th of 2,798 nationally.
Compared with IA, the US and 2017
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Sac County, 2018
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 16, 2018 22:15 | March 17, 2018 00:15 | 2h | 1,360 | 2,023 |
| 2 | January 22, 2018 16:00 | January 22, 2018 21:15 | 5h 15m | 616 | 584 |
| 3 | July 14, 2018 11:15 | July 14, 2018 11:30 | 15m | 302 | 76 |
| 4 | April 15, 2018 01:30 | April 16, 2018 01:15 | 23h 45m | 234 | 1,780 |
| 5 | January 22, 2018 22:30 | January 22, 2018 23:00 | 30m | 208 | 104 |
| 6 | September 18, 2018 17:30 | September 18, 2018 19:00 | 1h 30m | 207 | 311 |
| 7 | August 7, 2018 09:15 | August 8, 2018 00:00 | 14h 45m | 170 | 456 |
| 8 | February 19, 2018 05:30 | February 19, 2018 09:30 | 4h | 97 | 361 |
| 9 | July 29, 2018 14:00 | July 29, 2018 15:30 | 1h 30m | 95 | 103 |
| 10 | August 10, 2018 23:30 | August 11, 2018 05:45 | 6h 15m | 95 | 335 |
Outage episodes by size in 2018: 7 reached 100+ customers, 1 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 2018, 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 | 2018 | 1.9 hrs | 1.18 | 75 min | 0.96 |
| Iowa Lakes Electric Coop | 2018 | 1.8 hrs | 1.06 | 88 min | 0.98 |
| 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 89% of Iowa's customers in 2018; 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, 2018, 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/2018/iowa/sac-county