Electric energy is the most popular

Electric energy is the most popular form of energy because it can be transported
easily at high efficiency and reasonable cost. Nowadays the real-world electric power
systems are large-scale and highly complex interconnected transmission systems. An
electric power system can be subdivided into four major parts that are generation,
transmission, distribution and load. The purpose of a transmission system is to
transfer electric energy from generating units at various locations to the distribution
systems that ultimately supply the load. Transmission lines that also interconnect
neighbouring utilities permit economic power dispatch across regions during normal
conditions as well as the transfer of power between regions during emergency.