County annual report · FIPS 19079
2023 Hamilton County, IA Power Outage Report
In 2023, customers in Hamilton County, IA went without power for an average of 1.3 hours, a total of 12K customer-hours (Iowa average 2.0 hours). That ranks 62nd worst of 99 Iowa counties and 2553rd of 2,977 nationally.
Compared with IA, the US and 2022
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Hamilton County, 2023
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 14, 2023 19:45 | March 15, 2023 01:45 | 6h | 822 | 2,031 |
| 2 | May 18, 2023 19:15 | May 18, 2023 20:45 | 1h 30m | 629 | 943 |
| 3 | May 25, 2023 08:45 | May 25, 2023 11:45 | 3h | 629 | 744 |
| 4 | September 19, 2023 10:15 | September 19, 2023 19:45 | 9h 30m | 359 | 790 |
| 5 | November 10, 2023 16:45 | November 10, 2023 17:00 | 15m | 313 | 78 |
| 6 | September 16, 2023 16:00 | September 16, 2023 20:15 | 4h 15m | 206 | 757 |
| 7 | March 2, 2023 15:15 | March 2, 2023 15:45 | 30m | 205 | 59 |
| 8 | June 23, 2023 15:00 | June 23, 2023 16:30 | 1h 30m | 203 | 305 |
| 9 | August 15, 2023 13:45 | August 15, 2023 15:30 | 1h 45m | 181 | 317 |
| 10 | November 20, 2023 20:45 | November 20, 2023 22:00 | 1h 15m | 176 | 61 |
Outage episodes by size in 2023: 17 reached 100+ customers, 0 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 Hamilton County reported on EIA Form 861 for 2023, 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 | 2023 | 2.8 hrs | 1.13 | 78 min | 0.83 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Midland Power Coop | - | - | - | - | - |
| Prairie Energy Coop | - | - | - | - | - |
| City of Story City - (IA) | - | - | - | - | - |
| Cass Electric Coop | - | - | - | - | - |
| City of Stratford - (IA) | - | - | - | - | - |
| City of Ellsworth - (IA) | - | - | - | - | - |
| City of Stanhope - (IA) | - | - | - | - | - |
| City of Webster City - (IA) | - | - | - | - | - |
| Pleasant Hill Community Line | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Iowa's customers in 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 9,205 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. Hamilton County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Hamilton County, IA annual power outage report, 2023, 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/2023/iowa/hamilton-county