Ada CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 hr | 27,698 (11%) | Unnamed event |
| Jan 16, 2020 | 3 hrs | 25,931 (10%) | Unnamed event |
| Jul 12, 2019 | <1 hr | 14,795 (6%) | Unnamed event |
| Jan 10, 2019 | 1 hrs | 14,722 (6%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Ada County, Idaho that day.
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).
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 | Not ranked | — |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.