The physical evidence of the service. The physical evidence of the service is when the lights turn on when a switch is flipped. It is quite evident when there is electricity and when there isn't. Time is the first factor. The electricity must be available at all times to all customers.
Location is important.
Western has 12 energy centers throughout its service area. Each of these energy centers help contribute to the amount of electricity customers need to be served all of the time. The largest energy center is Jeffrey Energy Center, located 35 miles northwest of Topeka, Kansas. Western must also account for the volatility of demand. Heat waves and cold snaps greatly affect the amount of energy customers use.