Colby-Killdeer 345 kV Electric Transmission Project

Reliable, sustainable, efficient energy is critical to the quality of life we enjoy. To improve electric reliability, enable more electric generating sources to connect to customers, and meet the region’s growing energy needs, ITC Midwest (ITC) built a new high-voltage electric transmission line in north central Iowa.

The Colby-Killdeer 345,000-volt (345 kV) line is part of a network of new 345 kV transmission lines planned by ITC and MidAmerican Energy to serve the region. This new ITC line runs approximately 12 miles from the company’s Colby substation northwest of Mason City to ITC’s Killdeer substation southwest of Mason City. ITC built the line on new structures that also will carry an existing 161 kV transmission line that currently serves the area. 

Colby_Killdeer

Multiple Benefits
MISO, the independent transmission organization for the 11-state region that includes Iowa, has studied and designated 17 transmission projects as “Multi-Value Projects” (MVPs). The Colby-Killdeer line is a portion of one of those projects. These lines will bring four major benefits to northern Iowa and the rest of the MISO region: improved reliability, expanded access to generation sources, increased system efficiency, and economic investment.

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PROJECT PROFILE
 

  • How big will this line be?
    Depending on the terrain along the line route, the new tubular steel poles are between 100 to 175 feet tall and are spaced approximately 800 to 1,100 feet apart, varying with terrain and local conditions. The structures are installed on concrete foundations that are between eight and 12 feet in diameter.
  • How was this route chosen?
    The primary factor in determining the line route is the proposed locations of the Colby and Killdeer substations along the line route. To minimize impact on landowners where possible, ITC is proposing to locate the new line in an existing transmission line corridor, placing both lines on opposite sides of new single-pole structures. To determine the appropriate route to connect the substations, ITC carefully considered all of the factors mandated by Iowa Code §478.18(2) and Section 11.1(7) of the Iowa Administrative Code
  • What is the timing for construction?
    ITC began construction in the fourth quarter of 2014 with projected completion and clean up by the end of the year 2015.

 
 
 

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