Hamilton CountyPower Outage History
2018–2025 · Texas
Better than average — fewer or shorter outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 24, 2021 | 2 hrs | 1,585 (30%) | Unnamed event |
| Feb 15, 2021 | 74 hrs | 1,192 (23%) | Winter Storm Uri |
| Oct 30, 2025 | <1 hr | 1,128 (22%) | Unnamed event |
| Jul 3, 2025 | 2 hrs | 911 (17%) | Unnamed event |
| Feb 15, 2025 | 6 hrs | 911 (17%) | Unnamed event |
Over the 8 years from 2018 to 2025, Hamilton County recorded 399 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Hamilton County started May 24, 2021, lasting 2 hours and leaving up to 1,585 customers without power (30% of the county) at its peak.
May has historically been the worst month for outages in Hamilton County, with 73 events recorded during that month across the dataset.
Based on this history, Hamilton County earns a Reliability Grade of B, placing it in the 68th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Hamilton County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides or the Texas storm prep checklist.
Similar counties in Texas
Counties with the closest reliability grade and national percentile to Hamilton County.
| County | Grade | National percentile |
|---|---|---|
| Karnes County | B | 68th |
| Kendall County | B | 68th |
| Stonewall County | B | 69th |
| Crane County | B | 67th |
| Cottle County | B | 69th |
Most reliable counties in Texas
The top 3 counties in Texas by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Zavala County | A | 95th |
| Jasper County | A | 94th |
| Fayette County | A | 91st |
Least reliable counties in Texas
The bottom 3 counties in Texas by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Trinity County | F | 2nd |
| Orange County | F | 2nd |
| Marion County | F | 4th |
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 Hamilton County?
Between 2018 and 2025, Hamilton County recorded 399 outage events, averaging 2.6 hours each.
What is Hamilton County's reliability grade?
Hamilton County has a Reliability Grade of B, in the 68th national percentile.
What was the worst power outage in Hamilton County?
The worst outage on record started May 24, 2021, lasting 2 hours and affecting up to 1,585 customers.