Ada County Power Outage History
2015–2025 · Idaho
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jan 16, 2020 | 1 hrs | 29,618 (11%) | Unnamed event |
| Apr 19, 2022 | 1 hrs | 27,698 (11%) | Unnamed event |
| Jan 16, 2020 | 3 hrs | 25,931 (10%) | Unnamed event |
| Jul 12, 2019 | 0 hrs | 14,795 (6%) | Unnamed event |
| Jan 10, 2019 | 1 hrs | 14,722 (6%) | Unnamed event |
Over the 11 years from 2015 to 2025, Ada County recorded 1,171 distinct power outage events, averaging 1.7 hours per event.
The single worst outage on record in Ada County started January 16, 2020, lasting 1 hours and leaving up to 29,618 customers without power (11% of the county) at its peak.
August has historically been the worst month for outages in Ada County, with 129 events recorded during that month across the dataset.
Based on this history, Ada County earns a Reliability Grade of A, placing it in the 92nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Ada County's outage profile
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Outage-prep kit
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Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Ada County.
| County | Grade | National percentile |
|---|---|---|
| Camas County | A | 92nd |
| Cassia County | A | 90th |
| Minidoka County | A | 95th |
| Canyon County | A | 88th |
| Custer County | A | 97th |
FAQ
How often does power go out in Ada County?
Between 2015 and 2025, Ada County recorded 1,171 outage events, averaging 1.7 hours each.
What is Ada County's reliability grade?
Ada County has a Reliability Grade of A, in the 92nd national percentile.
What was the worst power outage in Ada County?
The worst outage on record started January 16, 2020, lasting 1 hours and affecting up to 29,618 customers.