About one-third of global energy isconsumed in residential, public, and commercial buildings(collectively referred to as buildings), where it is usedfor space heating, cooling, ventilating, lighting, cooking,water heating, refrigerating, and operating electric andmechanical devices. Global energy use in buildings isexpected to grow as cities in developing countries continueto modernize and per capita income levels continue toincrease. Because of their high energy consumption,residential, public, and commercial buildings also offerunparalleled opportunities for energy savings. According tothe International Energy Agency, buildings account for some41 percent of global energy savings potential by 2035,compared with the industrial sector (24 percent) and thetransport sector (21 percent). This guidance note outlineshow cities can tap into a wide array of proven technologies,policies, and financing mechanisms to improve energyefficiency and capture cost-effective energy savings inbuildings. It offers city leaders advice on how to getstarted in introducing energy efficiency measures, andprovides lessons and examples from successful programs thathave been introduced worldwide.
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