About the Thumb Loop ProjectThe Thumb Loop project consists of approximately 140 miles of double-circuit 345,000 volt (345 kV) transmission lines and four new substations. It will serve as the "backbone" of a system designed to meet the identified maximum wind energy potential of the Thumb region and will be capable of supporting a maximum capacity of about 5,000 MW. As an important link in the high-voltage transmission system in Michigan and the region, it also will contribute to reducing congestion, improving system reliability and facilitating wholesale market competition. Additional lines and facilities will be needed in the future as wind generators go into service and connect to the backbone system. The project will be constructed in stages, with the first segment, the western side of the loop from Tuscola County to Huron County, scheduled to start construction in 2012 and finish in late 2013. The remainder is targeted for completion by 2015. For more information about the Thumb Loop project, please visit www.itctransco.com. About ITC Transmission International Transmission Company ( d/b/a ITC Transmission) is a wholly-owned subsidiary of ITC Holdings Corp., the nation's largest independent electricity transmission company. Based in Novi, Michigan, ITC Transmission owns, operates and maintains approximately 2,800 circuit miles of transmission line in southeast Michigan, serving a population of 5.1 million. For more information, please visit http://www.itctransco.com . About ITC Holdings Corp. ITC Holdings Corp. (NYSE: ITC) is the nation's largest independent electricity transmission company. Based in Novi, Mich., ITC invests in the electric transmission grid to improve system reliability, expand access to markets, lower the overall cost of delivered energy and allow new generating resources to interconnect to its transmission systems. ITC's regulated operating subsidiaries include ITC Transmission, Michigan Electric Transmission Company, ITC Midwest and ITC Great Plains. Through these subsidiaries, ITC owns and operates high-voltage transmission facilities in Michigan, Iowa, Minnesota, Illinois, Missouri and Kansas, serving a combined peak load exceeding 26,000 megawatts along 15,000 circuit miles of transmission line. Through ITC Grid Development and its subsidiaries, the company also focuses on expansion in areas where significant transmission system improvements are needed. For more information, please visit: http://www.itc-holdings.com .