County annual report · FIPS 19023
2021 Butler County, IA Power Outage Report
In 2021, customers in Butler County, IA went without power for an average of 8.5 hours, a total of 41K customer-hours (Iowa average 2.7 hours). That ranks 15th worst of 99 Iowa counties and 890th 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 Butler 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 11, 2021 06:15 | December 13, 2021 04:45 | 1d 22h | 1,928 | 15K |
| 2 | December 16, 2021 01:00 | December 20, 2021 11:15 | 4d 10h | 1,709 | 12K |
| 3 | December 14, 2021 09:00 | December 14, 2021 12:00 | 3h | 1,692 | 5,054 |
| 4 | June 11, 2021 17:00 | June 11, 2021 21:15 | 4h 15m | 646 | 311 |
| 5 | October 8, 2021 22:15 | October 8, 2021 23:15 | 1h | 359 | 325 |
| 6 | May 1, 2021 16:15 | May 3, 2021 11:30 | 1d 19h | 357 | 1,996 |
| 7 | August 10, 2021 18:45 | August 10, 2021 21:00 | 2h 15m | 224 | 107 |
| 8 | March 16, 2021 00:15 | March 16, 2021 18:30 | 18h 15m | 214 | 915 |
| 9 | March 10, 2021 17:15 | March 10, 2021 18:30 | 1h 15m | 204 | 255 |
| 10 | March 28, 2021 23:45 | March 29, 2021 01:30 | 1h 45m | 150 | 39 |
Outage episodes by size in 2021: 14 reached 100+ customers, 3 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 Butler 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 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Butler County Rural Elec Coop - (IA) | - | - | - | - | - |
| Franklin Rural Electric Coop - (IA) | - | - | - | - | - |
| Grundy County Rural Elec Coop | - | - | - | - | - |
| Cedar Falls Utilities | - | - | - | - | - |
| City of Aplington | - | - | - | - | - |
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 ÷ 4,791 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. Butler County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Butler 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/butler-county