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Honolulu Seawater Air Conditioning – Keeping cool via the abyss

Downtown Honolulu

Cold seawater will soon be pumped from the ocean’s bottom to cool more than half of downtown Honolulu. This $240 million project by Honolulu Seawater Air Conditioning LLC owned by investors in Hawaii, Sweden, and Minnesota, and managed by Renewable Energy Innovations – could cut the city’s air conditioning electricity usage up to 75% while slashing carbon emissions and the use of ozone-depleting refrigerants.


A five-foot wide pipeline will run hundreds of feet below the ocean, suck up thousands of gallons of frigid water and discharge it through air-conditioning units around the city. Warmed saltwater will then be dumped back into the ocean at a level and temperature that supposedly won’t harm nearby marine life. This sounds like recycling at its best!


With plans to break ground next summer, the first 40 buildings should come online in 2012. Similar projects are already in place in Stockholm and Toronto. If this one works, this renewable energy system would then spread to nearby tourist-strong Waikiki, helping relieve stress from their power grid.

Honolulu Seawater Air Conditioning, LLC, is currently developing a 25,000-ton seawater air conditioning district cooling system for downtown Honolulu. This renewable energy system is designed to cool buildings in the downtown core using deep ocean cold water. A seawater air conditioning (SWAC) system is a cost-effective and attractive “green energy” investment, and a smart way to use renewable energy for air conditioning.

Tags: honolulu+seawater+air+conditioning, sea+water+air+conditioning

1 Comment

  • hi nice post thank you

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