Net-zero energy homes are nothing new. Houses that generate all of their energy needs through solar or other renewable energy systems are offered by builders across the country and in California, they will be mandated by the year 2020.

What is unusual is homes that generate more energy than they need. Inhabitat contributor Lucy Wang has rounded up eight of the most cutting-edge, from a carbon-positive contemporary to a home that rotates throughout the day to optimize the sun's rays.

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