Restoring the power after a severe storm involves much more than just flipping a switch at a substation or pulling a fallen tree off a downed power line. Highly trained workers from local electric cooperatives, specialists from the Iowa Association of Electric Cooperatives and, in the worst cases, crews from neighboring states work together around the clock to restore service.
Make sure you report any outage to your electric co-op, even if you think a neighbor already has called. This will help line crews isolate and repair the problem as soon as possible.
Here are the steps co-ops follow in restoring power. At each stage, the primary goal is getting the greatest number of co-op members back online in the shortest time possible. Check the Statewide Outage Map for the real-time status of electric cooperative outages across Iowa; it's automatically updated every 15 minutes.
1. Transmission towers and lines that supply power to one or more transmission substations rarely fail. However, when damage does occur – usually due to high winds or ice buildup – these towers and lines must be repaired before other parts of the distribution system are inspected, because they serve thousands (or ten of thousands) of people.
2. A co-op usually has several local distribution substations, each serving hundreds or thousands of co-op members. When a major outage takes place, these substations usually are checked first to see if the problem is in the transmission system to the substations or the substations themselves.
3. If the problem cannot be isolated at a local distribution substation, the next step is to check the distribution lines that carry power to groups of customers such as towns or housing developments. In Iowa, the largest cause of outages is fallen trees, which is why your co-op has an ongoing right-of-way maintenance program.
4. Then, the line crews work on outages that are more localized by inspecting the final supply lines – called tap lines – that carry power to utility poles or underground transformers outside small businesses, schools and homes.
5. Finally, isolated outages – caused, for example, by a damaged service line between a transformer and an individual home – are repaired.