County annual report · FIPS 19171
2025 Tama County, IA Power Outage Report
In 2025, customers in Tama County, IA went without power for an average of 3.4 hours, a total of 27K customer-hours (Iowa average 2.9 hours). That ranks 45th worst of 99 Iowa counties and 1942nd 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 Tama 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 | September 23, 2025 01:30 | September 23, 2025 20:15 | 18h 45m | 1,403 | 2,476 |
| 2 | March 15, 2025 10:15 | March 15, 2025 15:45 | 5h 30m | 651 | 1,174 |
| 3 | July 30, 2025 05:45 | July 31, 2025 05:30 | 23h 45m | 639 | 2,810 |
| 4 | June 12, 2025 00:45 | June 12, 2025 07:30 | 6h 45m | 561 | 1,066 |
| 5 | August 14, 2025 16:15 | August 18, 2025 21:00 | 4d 4h | 539 | 1,432 |
| 6 | June 20, 2025 00:45 | June 23, 2025 12:00 | 3d 11h | 486 | 2,674 |
| 7 | July 19, 2025 02:30 | July 21, 2025 13:30 | 2d 11h | 338 | 1,130 |
| 8 | May 30, 2025 10:00 | May 30, 2025 15:00 | 5h | 336 | 1,664 |
| 9 | May 17, 2025 05:15 | May 17, 2025 07:30 | 2h 15m | 318 | 715 |
| 10 | June 26, 2025 04:00 | June 26, 2025 08:45 | 4h 45m | 316 | 1,422 |
Outage episodes by size in 2025: 18 reached 100+ customers, 1 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 Tama 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 |
|---|---|---|---|---|---|
| East-Central Iowa Rural Elec Coop | 2024 | 38 min | 0.53 | 38 min | 0.53 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Consumers Energy Coop - (IA) | 2024 | 8.2 hrs | 1.54 | 1.6 hrs | 1.00 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Grundy County Rural Elec Coop | - | - | - | - | - |
| City of Traer - (IA) | - | - | - | - | - |
| City of Dysart - (IA) | - | - | - | - | - |
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 ÷ 8,169 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. Tama County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Tama 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/tama-county