Oahu Power Outage Leaves Tens Of Thousands In The Dark As Kona Storm Damages Key Lines

A major Oahu power outage stretched into Saturday after severe weather damaged transmission lines serving Windward Oahu, Hawaiʻi Kai, East Honolulu and parts of Waikiki, leaving some customers facing prolonged blackouts as crews worked in hazardous conditions.

The biggest disruption unfolded Friday evening when the last remaining transmission line feeding parts of East Honolulu and Windward Oahu was hit at about 11:50 p.m. ET. Power was later restored to roughly 29,000 customers, but large areas of Oahu were still without electricity overnight as the Kona storm continued to lash the islands with heavy rain, strong winds and flash-flood threats.

What Happened On Oahu

The outage crisis built through the day Friday as the storm intensified.

By 6 p.m. ET, utility crews said about 113,800 customers on Oahu were without power. Earlier damage had already knocked out two transmission lines running from near Waimānalo across the Koʻolau range into East Honolulu, leaving one line carrying service into a broad section of the island.

That backup line then failed later in the evening under dangerous weather conditions, sharply worsening the situation for customers in Windward Oahu and East Honolulu. By 2:30 a.m. ET Saturday, the Oahu total had climbed to about 123,000 customers without electricity, part of a wider statewide emergency affecting Maui County and Hawaiʻi Island as well.

A major restoration then brought electricity back to around 29,000 customers in East Honolulu and Waikiki, easing some of the pressure but not ending the outage emergency.

Why East Honolulu And Windward Oahu Were Hit So Hard

The hardest-hit neighborhoods were tied to a vulnerable transmission corridor linking Windward Oahu to East Honolulu.

That area depends on lines running along the base of the Koʻolau mountains and over steep terrain. Once multiple lines were damaged, crews warned restoration could slow dramatically because access becomes far more difficult during high winds, heavy rain and unstable ground conditions.

That risk turned a routine storm response into a more serious infrastructure problem. Even where crews identified the damaged equipment, repairs still depended on weather safe enough for access and restoration work.

The result was a patchwork outage pattern, with some areas coming back online while others remained dark for hours longer.

Some Customers Were Warned To Expect Overnight Outages

Utility officials had already warned Friday that some Oahu customers should prepare to be without power overnight, and that message proved accurate as the storm worsened.

The concern was especially high in Hawaiʻi Kai and East Honolulu, where loss of the final working line could extend outages beyond the initial response window. The same storm system also knocked out traffic lights in some areas, adding to travel hazards and slowing movement around the island.

Drivers in affected areas were urged to treat dark intersections as four-way stops, while residents were told to avoid downed lines, standing water and damaged electrical equipment.

Those safety warnings remain central as long as storm impacts continue.

The Kona Storm Is Still Driving The Crisis

This was not an isolated equipment failure. The Oahu power outage is part of a broader storm emergency tied to a powerful Kona low moving across Hawaiʻi.

Heavy rain, damaging winds and flood risks forced school closures and service disruptions beyond the electric grid. On Oahu, the weather threat has complicated every stage of restoration, from locating damage to reaching affected lines and safely carrying out repairs.

That also means outage numbers can change quickly. Some customers may regain service while new outages emerge elsewhere as wind and rain continue.

For residents trying to judge how long the blackout may last, that makes the situation fluid rather than fixed.

What To Watch Next

The next key question is whether weather conditions improve enough for crews to fully stabilize the damaged transmission network on Oahu.

If access opens up and no additional lines fail, restoration should continue to spread through the hardest-hit communities. If the storm remains severe, some customers could still face longer delays than a standard outage.

For now, the outage story on Oahu is less about a single neighborhood and more about a storm-struck transmission system under strain. The partial restoration in East Honolulu and Waikiki was a significant step, but it did not mark the end of the emergency.

As Saturday develops, the pace of repair work and the path of the storm will determine whether Oahu moves toward broader recovery or another difficult round of outages.