Honolulu County Power Outage History
2017–2025 · Hawaii
Better than average — fewer or shorter outages than most counties. How grades are calculated
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%) | Flood |
| Mar 8, 2023 | 28 hrs | 35,085 (11%) | High Surf |
| Feb 10, 2019 | 23 hrs | 32,353 (10%) | High Surf |
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).
Sized for Honolulu County's outage profile
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Outage-prep kit
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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 |
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.