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Environment

Zero-energy condos spring up across Japan

Highly efficient homes use only as much energy as they generate

A concept drawing of a condo building Daikyo is constructing in Hyogo Prefecture, with solar panels covering most of the roof. (Photo by Shuntaro Fukutomi)

TOKYO -- About 1,500 so-called zero-energy apartments are slated for construction in Japan by 2021, as developers expand the advanced building concept beyond detached homes.

Zero-energy homes -- sometimes referred to as zero net energy homes -- consume roughly as much energy as they generate through solar panels and other renewable energy sources.

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