According to experts, the placement and orientation of solar panels is just as important as which type of solar panel is used in a given situation. In order for solar panels to reach their peak generation capacity, a panel must face the correct direction and have the appropriate tilt according to their geographical. Taking into account the importance of the orientation and the tilt, why then are East-West facing structures on the rise? Basically, the reason. As an example of a utility scale application of East-West structures, the Neoen's project “Cestas”would generate 15% less total energy than a south-facing plant of the same capacity. However, in terms of LCOE [levelized cost of energy], the plant turned out to be. In terms of commercial roofs, which tend to be flatter and therefore easier to design, east-west structures allow warehouses, factories and offices to fit as many panels as possible onto their roofs. Additionally, south-facing panels tilted at 30° need heavy concrete. In the residential sector, east-west estructures are also having an impact as a result of falling feed-in tariffs (FITs) and rising electricity.