County annual report · FIPS 19013
2021 Black Hawk County, IA Power Outage Report
In 2021, customers in Black Hawk County, IA went without power for an average of 1.1 hours, a total of 65K customer-hours (Iowa average 2.7 hours). That ranks 83rd worst of 99 Iowa counties and 2615th 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 Black Hawk 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 | August 24, 2021 19:45 | August 26, 2021 06:00 | 1d 10h | 2,798 | 7,826 |
| 2 | July 14, 2021 16:00 | July 15, 2021 23:15 | 1d 7h | 2,495 | 11K |
| 3 | March 14, 2021 22:00 | March 15, 2021 05:45 | 7h 45m | 1,250 | 1,261 |
| 4 | May 15, 2021 14:15 | May 16, 2021 01:15 | 11h | 1,227 | 1,189 |
| 5 | August 6, 2021 22:15 | August 8, 2021 23:30 | 2d 1h | 1,078 | 8,912 |
| 6 | March 29, 2021 15:30 | March 29, 2021 18:45 | 3h 15m | 1,047 | 781 |
| 7 | June 28, 2021 21:15 | June 28, 2021 22:45 | 1h 30m | 734 | 368 |
| 8 | September 4, 2021 16:45 | September 4, 2021 18:30 | 1h 45m | 688 | 536 |
| 9 | December 15, 2021 19:45 | December 17, 2021 05:30 | 1d 9h | 580 | 6,792 |
| 10 | August 9, 2021 04:15 | August 9, 2021 04:30 | 15m | 558 | 140 |
Outage episodes by size in 2021: 46 reached 100+ customers, 6 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 Black Hawk 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 |
| East-Central Iowa Rural Elec Coop | 2021 | 1.7 hrs | 1.30 | 88 min | 1.10 |
| Interstate Power and Light Co | - | - | - | - | - |
| Grundy County Rural Elec Coop | - | - | - | - | - |
| Cedar Falls Utilities | - | - | - | - | - |
| La Porte City Utilities | - | - | - | - | - |
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 ÷ 57,533 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. Black Hawk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Black Hawk 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/black-hawk-county