An Otter Tail Company

Langdon Wind Energy Center photos

Transmission facilities

Click on any photo to see an enlargement

Existing power lines had to be cut and then spliced to move the cranes from one site to another.
Spools of wire wait to be strung for the 115-kv transmission line that goes ten miles from the collector substation to the Langdon Substation.
Most of the transmission line consists of single wood poles. Steel self-supporting poles were used when needed to eliminate the need for guy wires in the farmers' fields.
Click to see enlargement This rebar assembly goes down in the 20-foot hole at the base of the self-supporting steel poles.
After the rebar is in place, the 20-foot hole is partially filled with cement. Next, workers insert this bolt cage and pump in more cement to finish filling the hole. When the cement is cured, the base of the self-supporting pole is ready to accept the bottom half of the pole.
Workers join the top and bottom halves of a self-supporting transmission pole. No welding or bolting are required.
Click to see an enlargement Workers string wire on the 35 miles of 115-kv transmission line that was built between the Langdon Substation and the Hensel Substation.