T&D World Magazine
thumb loop
The Thumb Loop transmission project consists of 789 steel monopoles and 32 steel lattice towers and 1,680 miles of wires.

ITC Energizes Thumb Loop Transmission Line

ITC invested an estimated $510 million to build the 345 kV line, which serves as the backbone of a system designed to meet the identified maximum wind energy potential of Michigan’s Thumb region.

ITCTransmission's Thumb Loop high-voltage transmission project is complete with the energization of the third and final phase of the project. ITC invested an estimated $510 million to build the 345 kV line, which serves as the backbone of a system designed to meet the identified maximum wind energy potential of Michigan’s Thumb region. It also will contribute to regional system reliability and facilitate wholesale market competition.

“Conceiving and completing the Thumb Loop project demonstrates the value of forward-thinking, collaborative planning between the state and key stakeholders,” said Joseph L. Welch, chairman, president and CEO of ITC Holdings Corp. “It’s a prime example of the effectiveness of ITC’s planning process, which identified the transmission needed to facilitate Michigan’s renewable energy goals while also strengthening the regional transmission grid. This project brings an increase in transmission system capacity and reliability while providing more efficient transmission of renewable energy. It also created jobs and will have a meaningful near and long-term impact on the economy of the region and the entire state.”

Governor Rick Snyder cited the Thumb Loop’s benefits to the people of Michigan. “The Thumb Loop has been a good investment for Michigan. It has allowed us to expand our agricultural processing abilities and allowed us to add low-cost renewable energy to our grid and saved Michigan ratepayers real money. It is a good example of why we need to evaluate transmission in our overall planning to ensure an adaptable, affordable, reliable, and environmentally protective energy future.”

“The entire ITC team worked tirelessly to bring the Thumb Loop into service ahead of the original end-of-2015 target,” said Linda Blair, ITC executive vice president, chief business unit officer and president, ITC Michigan. “This effort reflects ITC’s ongoing commitment to operational excellence and focused project management, working in close cooperation with landowners, communities and alliance partners and suppliers, many of whom are based in Michigan.”

During the construction phase of the Thumb Loop, ITC estimates the project had a direct impact of $366 million to the Michigan economy, including employment of local contractors, vendors and suppliers. The Thumb-area economy benefited from the demand for supplies and services such as concrete, hardware, fuel, gravel and trucking, as well as food, lodging and other personal needs for construction crews.

Studies by the Midcontinent ISO, the regional authority that oversees transmission for a 15-state area that includes Michigan, show that Multi-Value Projects such as the Thumb Loop are anticipated to produce benefits for customers in Michigan and the broader region of between two-and-a-half and four times the project cost.

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