A zero-energy home is a house designed to generate as much energy as it typically uses. This energy is generated through renewable sources such as wind and solar power, and is used for functions such as lighting, appliances, heating, and cooling. Other renewable sources a zero-energy home may use solar thermal, geothermal, wind, and biomass energy systems. Zero-energy homes also typically are highly insulated and designed to be extremely energy efficient, even before taking into account their renewable energy sources. Learn more about Tucson's zero energy here.