Publisher Summary This chapter focuses on the components that make up the modern power system. This chapter also focuses on the transmission of electric power and how to optimize its power transfer capability. Generators are the starting point in a power system where electricity is generated. The most commonly used type of generator is the synchronous generator, driven by a prime mover. The bulk transfer of electrical energy from generating power plants to substations located near population centers is achieved through high-voltage transmission lines. Interconnected transmission lines are referred to as high-voltage transmission networks. Electric utility companies have utilized aluminum conductor steel-reinforced (ACSR) as a common choice of conductor in transmission lines for many years. ACSR is used extensively on long spans as both ground and phase conductors because of its high mechanical strength-to-weight ratio and good current-carrying capacity. Due to this reason, the conductor temperature is normally influenced by weather condition as well as the electrical current loading of the conductor.