County annual report · FIPS 16001
2021 Ada County, ID Power Outage Report
In 2021, customers in Ada County, ID went without power for an average of 1.3 hours, a total of 338K customer-hours (Idaho average 5.7 hours). That ranks 39th worst of 43 Idaho counties and 2541st 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 Ada 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 | May 22, 2021 16:00 | May 22, 2021 22:30 | 6h 30m | 10,421 | 18K |
| 2 | May 19, 2021 18:00 | May 19, 2021 20:15 | 2h 15m | 8,700 | 6,514 |
| 3 | June 28, 2021 21:00 | June 29, 2021 05:00 | 8h | 7,525 | 15K |
| 4 | May 22, 2021 11:30 | May 22, 2021 14:15 | 2h 45m | 7,083 | 7,442 |
| 5 | May 1, 2021 21:15 | May 2, 2021 12:00 | 14h 45m | 7,049 | 12K |
| 6 | March 29, 2021 06:30 | March 30, 2021 05:15 | 22h 45m | 7,024 | 22K |
| 7 | April 9, 2021 15:00 | April 9, 2021 23:15 | 8h 15m | 6,870 | 9,757 |
| 8 | April 6, 2021 16:30 | April 6, 2021 22:15 | 5h 45m | 6,546 | 8,349 |
| 9 | June 23, 2021 05:15 | June 23, 2021 23:30 | 18h 15m | 5,883 | 21K |
| 10 | October 8, 2021 18:00 | October 8, 2021 19:30 | 1h 30m | 5,823 | 6,951 |
Outage episodes by size in 2021: 178 reached 100+ customers, 54 reached 1,000+ customers, 1 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 Ada 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 ÷ 256,537 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. Ada County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Ada 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/ada-county