County annual report · FIPS 19079
2025 Hamilton County, IA Power Outage Report
In 2025, customers in Hamilton County, IA went without power for an average of 2.7 hours, a total of 25K customer-hours (Iowa average 2.9 hours). That ranks 53rd worst of 99 Iowa counties and 2177th of 3,000 nationally.
Compared with IA, the US and 2024
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Hamilton County, 2025
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 19, 2025 17:45 | March 20, 2025 14:45 | 21h | 699 | 2,292 |
| 2 | August 15, 2025 21:15 | August 18, 2025 18:15 | 2d 21h | 690 | 3,759 |
| 3 | March 5, 2025 04:15 | March 6, 2025 21:30 | 1d 17h | 599 | 14K |
| 4 | April 23, 2025 18:30 | April 23, 2025 18:45 | 15m | 221 | 55 |
| 5 | July 11, 2025 06:45 | July 11, 2025 10:00 | 3h 15m | 193 | 341 |
| 6 | November 7, 2025 18:45 | November 7, 2025 19:45 | 1h | 139 | 91 |
| 7 | May 20, 2025 02:30 | May 20, 2025 19:15 | 16h 45m | 119 | 883 |
| 8 | June 26, 2025 22:30 | June 27, 2025 08:15 | 9h 45m | 106 | 469 |
| 9 | November 15, 2025 15:45 | November 15, 2025 16:30 | 45m | 88 | 66 |
| 10 | June 15, 2025 03:15 | June 15, 2025 07:00 | 3h 45m | 67 | 232 |
Outage episodes by size in 2025: 8 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 2025, 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 | 2024 | 5.5 hrs | 1.42 | 1.7 hrs | 0.94 |
| 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 2025; 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, 2025, 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/2025/iowa/hamilton-county