Steps for Restoring

JCPB crews work 365 days a year to ensure reliable electric service for all customers. When large power outages occur, our crews first work to restore power to the greatest number of metered customers at one time. As power is restored to large areas, crews work to restore individual, isolated cases. Generally, the steps followed to restore power are listed below:

Step 1: High-voltage transmission lines supply electricity to substations from TVA power plants where the electricity is produced. If the transmission lines are damaged, it is impossible for electricity to be supplied to anyone.
Step 2: Substations receive electricity from transmission lines. Large transformers located at substations reduce electric voltage from 69,000 volts to approximately 13,000 volts. Substations must be repaired before electricity is supplied to distribution lines.
Step 3: Distribution lines are the third link in the system to be repaired. Distribution lines may also be referred to as 3-phase lines and operate at 13,000 volts. These lines typically provide electricity to commercial and industrial customers, as well as supply electricity to single-phase lines.
Step 4: Single-phase lines or tap lines operate at 7,200 volts, supplying electricity to residential areas. During extreme power interruptions, it may take days in order to completely restore electricity to all tap lines as these are widespread and make up a large portion of our electric system.
Step 5: The final step in the restoration process is to restore electricity to individual homes and small services. During the final step, the electricity is generally supplied at a voltage of 120/240. Repairs to individual service lines and transformers are very time consuming as there are often numerous isolated cases, and these individual services must be repaired one job at a time.