County annual report · FIPS 16083
2021 Twin Falls County, ID Power Outage Report
In 2021, customers in Twin Falls County, ID went without power for an average of 2.4 hours, a total of 110K customer-hours (Idaho average 5.7 hours). That ranks 34th worst of 43 Idaho counties and 2080th of 2,974 nationally.
Compared with ID, the US and 2020
Coverage line is EAGLE-I's share of Idaho customers tracked each year.
Biggest outages in Twin Falls 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 | September 10, 2021 23:15 | September 11, 2021 02:00 | 2h 45m | 4,001 | 5,815 |
| 2 | June 2, 2021 07:00 | June 2, 2021 09:15 | 2h 15m | 3,846 | 8,652 |
| 3 | June 21, 2021 16:45 | June 21, 2021 17:00 | 15m | 3,038 | 760 |
| 4 | March 29, 2021 09:45 | March 29, 2021 19:00 | 9h 15m | 2,943 | 8,603 |
| 5 | February 14, 2021 05:15 | February 14, 2021 14:30 | 9h 15m | 2,884 | 11K |
| 6 | November 22, 2021 12:45 | November 22, 2021 14:45 | 2h | 2,458 | 4,205 |
| 7 | August 15, 2021 21:45 | August 15, 2021 23:00 | 1h 15m | 2,454 | 2,101 |
| 8 | September 6, 2021 04:15 | September 6, 2021 09:00 | 4h 45m | 2,382 | 4,368 |
| 9 | May 14, 2021 19:30 | May 14, 2021 20:15 | 45m | 2,365 | 637 |
| 10 | September 15, 2021 16:30 | September 16, 2021 01:45 | 9h 15m | 2,101 | 790 |
Outage episodes by size in 2021: 71 reached 100+ customers, 18 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 Twin Falls 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 |
|---|---|---|---|---|---|
| Idaho Power Co | 2021 | 3.1 hrs | 1.42 | 2.6 hrs | 1.25 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 90% of Idaho's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 46,267 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. Twin Falls County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Twin Falls County, ID 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/idaho/twin-falls-county