County annual report · FIPS 19171
2018 Tama County, IA Power Outage Report
In 2018, customers in Tama County, IA went without power for an average of 2.7 hours, a total of 22K customer-hours (Iowa average 2.2 hours). That ranks 33rd worst of 99 Iowa counties and 1610th of 2,798 nationally.
Compared with IA, the US and 2017
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Tama County, 2018
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 16, 2018 20:00 | August 16, 2018 21:30 | 1h 30m | 2,099 | 3,149 |
| 2 | July 19, 2018 22:00 | July 20, 2018 13:15 | 15h 15m | 1,225 | 6,188 |
| 3 | June 6, 2018 22:15 | June 7, 2018 19:15 | 21h | 1,014 | 3,591 |
| 4 | July 15, 2018 07:15 | July 15, 2018 09:00 | 1h 45m | 563 | 970 |
| 5 | July 1, 2018 00:30 | July 1, 2018 02:00 | 1h 30m | 540 | 677 |
| 6 | June 14, 2018 17:45 | June 14, 2018 19:15 | 1h 30m | 425 | 535 |
| 7 | August 29, 2018 06:45 | August 29, 2018 08:45 | 2h | 399 | 508 |
| 8 | September 5, 2018 21:15 | September 5, 2018 22:00 | 45m | 238 | 60 |
| 9 | September 18, 2018 15:00 | September 18, 2018 19:00 | 4h | 208 | 337 |
| 10 | January 3, 2018 16:30 | January 3, 2018 18:15 | 1h 45m | 188 | 327 |
Outage episodes by size in 2018: 17 reached 100+ customers, 3 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 2018, 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 |
|---|---|---|---|---|---|
| T I P Rural Electric Coop | 2018 | 2.5 hrs | 1.33 | 2.5 hrs | 1.33 |
| Consumers Energy Coop - (IA) | 2018 | 2.4 hrs | 1.61 | 1.6 hrs | 1.35 |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| East-Central Iowa Rural Elec Coop | - | - | - | - | - |
| 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 89% of Iowa's customers in 2018; 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, 2018, 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/2018/iowa/tama-county