About Underground Utilities
So, what's that green box in my yard? If you don't have overhead power lines, you will see a green box, called a pad-mounted transformer, in your yard or the neighbor's yard. Transformers change voltage from higher levels to a level people use in their homes for their electronics, appliances and lighting. Each of these transformers are vital to providing electricity to at least one home, but usually to several.
While overhead power lines are mounted on utility poles and substations are protected by security fences, pad-mounted transformers, switch boxes and pedestals are at ground level. Burying power lines reduces potential system damage from high winds and severe storms.
While members seldom see technicians working on the transformers unless there are power outages, they are regularly inspected by co-op crews riding through neighborhoods. Co-op technicians need at least 10-feet of clearance at the opening side of a pad-mounted transformer. That distance allows for tool use, including hot sticks - typically eight feet in length, used to work with energized equipment. It also ensures that one or two technicians working on a transformer have space to maneuver should they have to back away if problems occur. Therefore when considering landscaping, keep in mind how wide any bushes or shrubs you plant will grow and make sure there is plenty of clearance around the transformer in your yard (see graphics).
Pad-mounted transformers are connected to primary high voltage lines, and secondary lines can extend in several directions to distribute power to homes and businesses. That's why it's important to call 8-1-1 before you dig or plant shrubs or trees, set fence posts or install sprinkler systems where it might damage underground lines.