Tree Trimming
Tree Trimming | About Trees | FAQs Section | Contact Us
Black Hills Power is committed to providing reliable electric power every day. Our tree trimming program is critical when it comes to keeping your homes and businesses safe and reliable. Please visit the links above to learn more about this process and why we do it.
The degree to which a tree is trimmed depends on several factors: the tree species, voltage of power lines, and how close branches are to those lines.
Clearance Specifications |
230kV transmission power lines |
35 feet, or to the nearest lateral branch, on each side of the outer most conductors |
69kV sub-transmission power lines |
25 feet, or to the nearest lateral branch, on each side of the outer most conductors |
Below 69kV distribution power lines |
15 to 20 ft for fast-growing trees (i.e., Siberian elm, boxelder, silver maple); 10 ft, or to the nearest lateral branch, is the standard minimum approach distance for unqualified personnel |
Service lines, secondaries, & street light wires |
1 to 3 feet of clearance |
Know Your Utility Lines
Electric lines are usually located at the top of the pole, farthest from the ground. Cable TV and telephone lines run closer to the ground, below power lines. Contact your local cable and phone utilities to receive information about trimming requirements or any problems with these lines.
Never attempt to trim any vegetation near power lines
Only specially trained and approved line-clearing professionals should work around power lines.
Trees and storms
Scheduled, consistent tree trimming can help minimize power outages that may result from a storm. BHP does not clean up trees and limbs downed during a storm. When damage does occur and restoration efforts require the removal of trees or limbs from power lines, the debris will be left in as safe a manner as possible. Limb debris is not cleaned-up by BHP or its contractors after a storm or outage event.
Storm safety
When a power outage occurs, your safety is our main concern. Here are some basic tips to keep you and your family safe while the power is out:
- Assume all cables and wires are energized and stay away.
- Keep away from flooded and debris-laden areas because they may be hiding downed lines.
- Avoid driving in damaged areas. You might interfere with rescue or restoration efforts, as well as jeopardize your own safety.
- Report downed power lines by calling BHP in the Rapid City area 721-2475 or outside the area toll-free number 1-800-839-8197
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