Nearly every energy conservation measure possible has been applied in this green home in order to reach the zero energy goal. The remaining heating and cooling are provided by a geothermal system. The project has received city approval and is seeking state approval for a greywater and rainwater harvesting system that will be used both for toilet flushing and irrigation. The inverted roof visible in the rendering is designed for rainwater collection, but also cleverly hides the solar hot water and solar electric panels that round out the energy approach. This is a nice example of a design statement and two different performance goals all working in tandem.