Honolulu 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 |
|---|---|---|---|
| May 21, 2017 | 5 hrs | 62,188 (19%) | High Surf |
| Jun 3, 2017 | 2 hrs | 61,267 (18%) | High Surf |
| Jan 31, 2025 | 41 hrs | 38,334 (11%) | Flash Flood |
| Mar 8, 2023 | 28 hrs | 35,085 (11%) | High Surf |
| Feb 10, 2019 | 23 hrs | 32,353 (10%) | High Surf |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Honolulu County, Hawaii that day.
Over the 9 years from 2017 to 2025, Honolulu County recorded 2,969 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in Honolulu County started May 21, 2017 (High Surf), lasting 5 hours and leaving up to 62,188 customers without power (19% of the county) at its peak.
January has historically been the worst month for outages in Honolulu County, with 276 events recorded during that month across the dataset.
Based on this history, Honolulu County earns a Reliability Grade of B, placing it in the 64th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Hawaii
Counties with the closest reliability grade and national percentile to Honolulu County.
| County | Grade | National percentile |
|---|---|---|
| Kauai County | C | 59th |
| Maui County | C | 57th |
| Hawaii County | A | 82nd |
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 Honolulu County?
Between 2017 and 2025, Honolulu County recorded 2,969 outage events, averaging 1.9 hours each.
What is Honolulu County's reliability grade?
Honolulu County has a Reliability Grade of B, in the 64th national percentile.
What was the worst power outage in Honolulu County?
The worst outage on record started May 21, 2017 (High Surf), lasting 5 hours and affecting up to 62,188 customers.