Efficiency is everywhere, but it is an invisible resource and often underutilized. Energy efficiency is the fastest, cleanest, and cheapest way to meet energy needs -- India alone could save $42 billion each year by largely improving energy efficiency in buildings, which currently consume more than 30 percent of the country's electricity. With a projected skyrocketing increase in building-occupied area in India, from 8 billion square meters in 2005 to 41 billion by 2030, any building constructed without optimizing efficiency represents a lost opportunity to lock in energy and cost savings for decades.