The developers of a project that will use cold ocean water to provide air conditioning for downtown Honolulu said they have signed a major condominium project as a customer.

Honolulu Seawater Air Conditioning LLC will provide air conditioning for One Waterfront Towers, the distinctive 45-story twin-tower condo near Honolulu Harbor.

“We are pleased to announce another significant milestone in bringing clean, sustainable cooling technology to downtown Honolulu,” said Bill Mahlum, president and chief exective officer of Honolulu Seawater Air Conditioning.

The seawater airconditioning system will reduce the cooling costs for the 310-unit condo and eliminate the need to replace the buildings chillers in the future, said George Beavin, One Waterfront Towers Board of Directors President.

 The seawater air conditioning project is expected to be completed in 2013.