The 13-floor La Jolla Commons II office tower in San Diego will be the biggest "net-zero" energy building in the U.S. when it's completed in 2014, according to real estate firm Hines, which is developing the project along with J.P. Morgan Asset Management. Bloom Energy cells will be used and will convert methane from wastewater plants and landfills into electricity. "Our next step is to adapt what we have learned and apply it" in a less temperate environment, said Gary Holtzer, Hines' global sustainability officer.

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