County annual report · FIPS 19165
2021 Shelby County, IA Power Outage Report
In 2021, customers in Shelby County, IA went without power for an average of 1.9 hours, a total of 13K customer-hours (Iowa average 2.7 hours). That ranks 63rd worst of 99 Iowa counties and 2274th 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 Shelby 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 | December 15, 2021 20:00 | December 17, 2021 23:00 | 2d 3h | 638 | 5,208 |
| 2 | January 30, 2021 19:30 | January 30, 2021 20:45 | 1h 15m | 430 | 430 |
| 3 | April 29, 2021 16:30 | April 29, 2021 17:00 | 30m | 305 | 153 |
| 4 | May 26, 2021 13:15 | May 27, 2021 13:30 | 1d | 305 | 255 |
| 5 | April 29, 2021 06:45 | April 29, 2021 10:00 | 3h 15m | 303 | 834 |
| 6 | May 10, 2021 01:00 | May 10, 2021 03:00 | 2h | 224 | 448 |
| 7 | January 25, 2021 22:30 | January 25, 2021 23:00 | 30m | 206 | 103 |
| 8 | March 10, 2021 08:30 | March 10, 2021 12:45 | 4h 15m | 204 | 722 |
| 9 | April 8, 2021 09:45 | April 8, 2021 10:00 | 15m | 197 | 49 |
| 10 | March 29, 2021 21:00 | March 30, 2021 02:00 | 5h | 187 | 516 |
Outage episodes by size in 2021: 15 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 Shelby 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 |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2021 | 1.9 hrs | 1.04 | 75 min | 0.74 |
| Western Iowa Power Coop | 2018 | 47 min | 0.76 | 47 min | 0.76 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Nishnabotna Valley R E C | - | - | - | - | - |
| Harrison County Rrl Elec Coop | - | - | - | - | - |
| Atlantic Municipal Utilities | - | - | - | - | - |
| City of Shelby - (IA) | - | - | - | - | - |
| Harlan Municipal Utilities - (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 ÷ 7,164 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. Shelby County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Shelby 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/shelby-county