Abstract: This paper proposes three criteria for an energy efficient building: 1) the building must be equipped with efficient equipment and materials appropriate for the location and conditions; 2) the building must provide amenities and services appropriate to the building’s intended use; and 3) The building must be operated in such a manner as to have a low energy use compared to other, similar buildings. Later on in the paper we have discussed about the elements of energy efficiency and its usefulness. The concept of ZEB (Zero Energy Building) has also been introduced and its application in India. The later part of paper specifies the World’s Energy Efficient Superpower 2015 is US, which has come up with flying colors in the field of energy efficiency.

Keywords: ZEB (Zero Energy Building),World’s Energy Efficient Superpower.