Even with all of the energy efficiency features in the GreenBuild duplex, the feature that makes these homes really zero energy is the solar panels. Each home has a 6kW Solar Array that will produce roughly as much energy as the homes are estimated to use. The panels were installed on each home over the past week; EEHR plans to document the energy usage of the homes after they are constructed and occupied so that we can better understand how much energy is used in each home; how much energy is produced by the solar panels; and how accurate the energy models were when designing the homes.