Arithmetic Logic Unit is of core significance in digital technologies as it is an integral part of central processing unit. ALU is capable of calculating the results of a wide variety of basic arithmetical and logical computations. Binary addition is one of the greatest primitive and commonly used applications in computer arithmetic operation. Parallel Prefix Adders have been established as the most efficient circuits for binary addition. The energy efficient designs have gained more recent attention and for highly employed functional units, especially for the adders.