County annual report · FIPS 19153
2021 Polk County, IA Power Outage Report
In 2021, customers in Polk County, IA went without power for an average of 1.1 hours, a total of 303K customer-hours (Iowa average 2.7 hours). That ranks 86th worst of 99 Iowa counties and 2637th 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 Polk 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 15, 2021 15:30 | December 19, 2021 00:45 | 3d 9h | 9,343 | 54K |
| 2 | August 31, 2021 04:45 | September 1, 2021 07:00 | 1d 2h | 8,325 | 24K |
| 3 | June 20, 2021 10:00 | June 22, 2021 04:30 | 1d 18h | 7,917 | 16K |
| 4 | January 4, 2021 17:30 | January 4, 2021 23:15 | 5h 45m | 6,229 | 1,572 |
| 5 | August 17, 2021 19:30 | August 18, 2021 02:00 | 6h 30m | 5,100 | 10K |
| 6 | October 12, 2021 13:00 | October 12, 2021 17:15 | 4h 15m | 5,061 | 1,270 |
| 7 | June 30, 2021 06:00 | July 1, 2021 07:00 | 1d 1h | 4,740 | 1,729 |
| 8 | November 19, 2021 10:30 | November 19, 2021 23:15 | 12h 45m | 4,675 | 4,833 |
| 9 | July 16, 2021 13:15 | July 17, 2021 08:30 | 19h 15m | 4,019 | 3,220 |
| 10 | May 1, 2021 11:45 | May 2, 2021 05:15 | 17h 30m | 3,827 | 6,536 |
Outage episodes by size in 2021: 137 reached 100+ customers, 54 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 Polk 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 |
| Consumers Energy Coop - (IA) | 2021 | 1.8 hrs | 1.39 | 1.8 hrs | 1.39 |
| Interstate Power and Light Co | - | - | - | - | - |
| Midland Power Coop | - | - | - | - | - |
| Waverly Municipal Elec Utility | - | - | - | - | - |
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 ÷ 287,095 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. Polk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Polk 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/polk-county