Harris County Power Outage History
2014–2025 · Texas
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 8, 2024 | 258 hrs | 1,660,703 (91%) | Unnamed event |
| May 16, 2024 | 15 hrs | 502,077 (27%) | Hail |
| Feb 16, 2021 | 39 hrs | 455,986 (25%) | Winter Storm Uri |
| May 17, 2024 | 3 hrs | 416,868 (23%) | Hail |
| May 17, 2024 | 11 hrs | 391,529 (21%) | Hail |
Over the 12 years from 2014 to 2025, Harris County recorded 9,524 distinct power outage events, averaging 4.1 hours per event.
The single worst outage on record in Harris County started July 8, 2024, lasting 258 hours and leaving up to 1,660,703 customers without power (91% of the county) at its peak.
December has historically been the worst month for outages in Harris County, with 1,002 events recorded during that month across the dataset.
Based on this history, Harris County earns a Reliability Grade of F, placing it in the 12th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Texas
Counties with the closest reliability grade and national percentile to Harris County.
| County | Grade | National percentile |
|---|---|---|
| Freestone County | F | 12th |
| Walker County | F | 12th |
| Waller County | F | 12th |
| Morris County | F | 12th |
| Camp County | F | 12th |
FAQ
How often does power go out in Harris County?
Between 2014 and 2025, Harris County recorded 9,524 outage events, averaging 4.1 hours each.
What is Harris County's reliability grade?
Harris County has a Reliability Grade of F, in the 12th national percentile.
What was the worst power outage in Harris County?
The worst outage on record started July 8, 2024, lasting 258 hours and affecting up to 1,660,703 customers.