County annual report · FIPS 19171
2021 Tama County, IA Power Outage Report
In 2021, customers in Tama County, IA went without power for an average of 3.7 hours, a total of 31K customer-hours (Iowa average 2.7 hours). That ranks 40th worst of 99 Iowa counties and 1610th 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 Tama 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 8, 2021 06:15 | August 9, 2021 14:15 | 1d 8h | 3,296 | 6,569 |
| 2 | December 16, 2021 01:30 | December 16, 2021 21:30 | 20h | 3,211 | 10K |
| 3 | February 17, 2021 15:45 | February 17, 2021 16:00 | 15m | 1,183 | 296 |
| 4 | July 14, 2021 23:30 | July 15, 2021 05:45 | 6h 15m | 1,177 | 2,097 |
| 5 | June 14, 2021 12:15 | June 14, 2021 14:30 | 2h 15m | 428 | 430 |
| 6 | July 25, 2021 05:30 | July 25, 2021 07:45 | 2h 15m | 292 | 657 |
| 7 | June 2, 2021 21:15 | June 2, 2021 21:30 | 15m | 192 | 48 |
| 8 | August 10, 2021 20:45 | August 10, 2021 23:15 | 2h 30m | 182 | 223 |
| 9 | March 5, 2021 15:15 | March 5, 2021 17:30 | 2h 15m | 145 | 218 |
| 10 | July 9, 2021 23:30 | July 10, 2021 01:45 | 2h 15m | 128 | 287 |
Outage episodes by size in 2021: 17 reached 100+ customers, 4 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 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 |
|---|---|---|---|---|---|
| East-Central Iowa Rural Elec Coop | 2021 | 1.7 hrs | 1.30 | 88 min | 1.10 |
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Consumers Energy Coop - (IA) | 2021 | 1.8 hrs | 1.39 | 1.8 hrs | 1.39 |
| 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 91% of Iowa's customers in 2021; 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, 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/tama-county