Of all the energy options, the improvement of energy efficiency can provide the largest amount of energy in the future through many cost-effective opportunities while at the same time reducing greenhouse gas emissions. Many of these opportunities can be attained in a shorter timescale (and in a manner compatible with economic growth) than can investments in clean energy supply infrastructure, which though also needed. In addition, many energy efficiency measures can pay for themselves through reduced energy costs. Energy efficiency generates new income of its own, makes industries more competitive, improves consumer welfare and creates business opportunities. Despite the benefits, energy efficiency potential remains largely untapped. Factors such as irrational energy prices, perceived risks, technology availability, weak institutions, lack of information and skilled resources have hindered market development.