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Power Restoration
Restoring power after widespread outages is a big job that involves more than simply throwing a switch or removing a tree from a line. It involves a huge coordination effort with possibly hundreds of linemen, tree trimmers, and office personnel working in very dangerous situations. There is nothing routine when restoring power after a storm.
During an outage, Coastal Electric is committed to restoring the electric power to all co-op accounts as safely and quickly as possible. In this effort, our overriding goal is to safely restore power to the greatest number of members in the shortest time possible. In order to accomplish that, the process begins with a damage assessment of the co-op’s lines and facilities by employees who have been specifically trained to accomplish those tasks. The assessment allows the co-op to direct its resources (both labor and materials) to the areas where they are needed the most.
Repairs are first made to the co-op’s large transmission lines which carry high-voltage electricity to our distribution system from generation stations. Lines such as these must be repaired first along with any damage to transmission substations. Transmission lines serve many thousands of accounts.
Next in the process of restoration of power are the distribution substations and their respective main feeder lines. The co-op has 13 substations on its system and there are just under 2,000 miles of distribution and service lines that are routed from the substations. Main feeder lines are those that you normally see alongside a highway.
Individual tap lines are repaired next in the restoration process. Tap lines typically serve the fewest number of members.
Safety is our highest priority during any power restoration situation. Sometimes you will notice your lights going back off shortly after they have come back on. In some cases, it is necessary to remove power from an energized section in order to safely repair any damages or replace transformers or other line equipment. Most times the power will come back on once the repair is made. In other cases, your power may go off because it is a legitimate outage. When in doubt, you can always call 843–538-5800 to re-report the new outage.
The Steps to Restoring Power [PDF]
Hurricanes and ice storms. Tornadoes and blizzards. Electric cooperative members have seen them all in the last few years. And with such severe weather comes power outages. Restoring power after a major outage is a big job that involves much more than simply throwing a switch or removing a tree from a line.
The main goal is to restore power safely to the greatest number of members in the shortage time possible.
The major cause of outages is damage caused by fallen trees. That your electric cooperative has an ongoing right-of-way maintenance program.
The illustration above explains how power is typically restored after a major disaster, such as a hurricane or tornado. While power restoration priorities may differ from co-op to co-op, electric system repairs generally follow a plan similar to the one illustrated here.
Step 1. Transmission towers and lines supply power to one or more transmission substations. These lines seldom fail, but they can be damaged by a hurricane or tornado. Tens of thousands of people could be served by one high-voltage transmission line, so if there is damage here it gets attention first.
Step 2. A co-op may have several local distribution substations, each serving thousands of consumers. When a major outage occurs, the local distribution substations are checked first. A problem here could be caused by a failure in the transmission system supplying the substation. If the problem can be corrected at the substation level, power may be restored to a large number of people.
Step 3. Main distribution supply lines are checked next if the problem cannot be isolated at the substation. These supply lines carry electricity away from the substation to a group of consumers, such as a town or housing development. When power is restored at this stage, all consumers served by this supply line could see the lights come on, as long as there is no problem further down the line.
Step 4. The final supply lines, called tap lines, carry power to the utility poles or underground transformers outside houses or other buildings. Line crews fix the remaining outages based on restoring service to the greatest number of consumers.
Step 5. Sometimes, the damage will occur on the service line between your house and the transformer on the nearby pole. This can explain why you have no power when your neighbor does. Your co-op needs to know you have an outage here, so a service crew can repair it.
Reprinted from Carolina Country (N.C. Association of Electric Cooperatives)


