County annual report · FIPS 16059
2021 Lemhi County, ID Power Outage Report
In 2021, customers in Lemhi County, ID went without power for an average of 4.8 hours, a total of 18K customer-hours (Idaho average 5.7 hours). That ranks 22nd worst of 43 Idaho counties and 1367th 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 Lemhi 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 | March 29, 2021 03:45 | March 29, 2021 23:00 | 19h 15m | 747 | 4,611 |
| 2 | March 30, 2021 16:30 | March 30, 2021 19:30 | 3h | 747 | 2,241 |
| 3 | May 4, 2021 14:15 | May 4, 2021 18:00 | 3h 45m | 744 | 2,257 |
| 4 | March 2, 2021 11:15 | March 2, 2021 14:45 | 3h 30m | 405 | 1,353 |
| 5 | December 26, 2021 11:00 | December 26, 2021 13:45 | 2h 45m | 352 | 968 |
| 6 | August 8, 2021 21:30 | August 9, 2021 00:30 | 3h | 328 | 346 |
| 7 | April 1, 2021 07:30 | April 1, 2021 12:00 | 4h 30m | 264 | 1,119 |
| 8 | November 6, 2021 16:00 | November 6, 2021 16:15 | 15m | 263 | 66 |
| 9 | May 30, 2021 18:45 | May 30, 2021 20:15 | 1h 30m | 192 | 230 |
| 10 | August 2, 2021 20:45 | August 2, 2021 22:15 | 1h 30m | 182 | 193 |
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 Lemhi 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 |
| Salmon River Electric Coop Inc | - | - | - | - | - |
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 ÷ 3,727 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. Lemhi County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Lemhi 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/lemhi-county