Pinal CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 23, 2024 | 4 hrs | 33,580 (22%) | Unnamed event |
| Jul 9, 2018 | 7 hrs | 16,371 (11%) | Drought |
| Jul 10, 2021 | 31 hrs | 15,541 (10%) | Drought |
| Jul 31, 2018 | 6 hrs | 12,044 (8%) | Drought |
| Jul 15, 2021 | 1 hrs | 11,485 (8%) | Drought |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Pinal County, Arizona that day.
Over the 11 years from 2015 to 2025, Pinal County recorded 1,163 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Pinal County started April 23, 2024, lasting 4 hours and leaving up to 33,580 customers without power (22% of the county) at its peak.
August has historically been the worst month for outages in Pinal County, with 188 events recorded during that month across the dataset.
Based on this history, Pinal County earns a Reliability Grade of B, placing it in the 74th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Arizona
Counties with the closest reliability grade and national percentile to Pinal County.
| County | Grade | National percentile |
|---|---|---|
| Santa Cruz County | B | 75th |
| Navajo County | B | 72nd |
| Coconino County | A | 86th |
| Pima County | A | 86th |
| Maricopa County | A | 86th |
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 Pinal County?
Between 2015 and 2025, Pinal County recorded 1,163 outage events, averaging 2.1 hours each.
What is Pinal County's reliability grade?
Pinal County has a Reliability Grade of B, in the 74th national percentile.
What was the worst power outage in Pinal County?
The worst outage on record started April 23, 2024, lasting 4 hours and affecting up to 33,580 customers.