homes in aurora will be expected to have an energy efficiency rating of at least 6 stars, achieved by using efficient appliances, solar-heating of water where possible, insulation of buildings and houses designed with good ventilation and orientation of windows. streets are designed for optimal capturing of solar power. aurora's water efficiency measures aim to have 54% less potable water consumed per person than normal houses, and are expected to discharge 90% less water into the sea. water efficient appliances will be used to minimise consumption.