Soaking up the sun to squeeze bills to zero

Jim Duffield works in the the largest net-zero energy office building in the nation. He’s still adjusting, six months after he and 800 engineers and managers and support staff from the National Renewable Energy Lab moved in to the $64 million building in Golden, Colo., which the federal agency has offered up as a template for how to do affordable, super-energy-efficient construction.

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