Abstract: Day by day, energy demand keeps rising so that, it is essential to generate massive amounts of energy. Meantime, there are many changes have been introduced to make buildings or complex more energy efficient. It is very important to understand the energy sources used in buildings. The generation of renewable energy sources can be helpful to reduce their energy demands. Along with this, it is also helpful to reduce carbon Dioxide (CO2) which is produced by the Buildings. Therefore, to achieve a sustainable energy building, it is essential to improve technologies in the buildings.