Principle 2: Renewable Energy for Zero CO2 Emissions Transform city districts into local power stations of renewable energy sources including solar PV, solar thermal, wind on-and-off-shore, biomass, geothermal power, mini-hydro energy and other new technologies.
Principle 4: Water Cities can be used as a water catchment area by educating the inhabitants in water efficiency, promoting rainwater collection and using waste water recycling and storm water harvesting techniques.