Rainwater harvesting is the collection and storage of rain from roofs or from a surface catchment for future use. The water is generally stored in rainwater tanks or directed into mechanisms which recharge groundwater.
Recycling is the reprocessing of materials into new products. It generally prevents waste of potentially useful materials, reduces the consumption of raw materials, and reduces energy usage.
Renewable energy effectively uses natural resources such as sunlight, wind, rain, tides and geothermal heat, which are naturally replenished.
A smart meter is a type of advanced utility meter that tracks consumption in more detail than a conventional meter; it often communicates that information via some network back to the utility for monitoring and billing purposes.
Solar power is harnessed energy from the sun, in such forms as solar heating systems and solar electricity.
Wind power is the conversion of wind energy into more useful forms, usually electricity, using wind turbines.
A zero energy building is a general term applied to a building with a net energy consumption of zero over a typical year. This can be measured in different ways, including cost, consumption, or carbon emissions.