ITC Transmission
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ITC Transmission, also known as International Transmission Company, is an electric transmission company based in Novi, Michigan, a Detroit suburb. The company is in charge of the electric transmission system formerly owned by Detroit Edison and Consumers Energy.
ITC was founded in 1999 as a subsidiary of Detroit Edison (itself a subsidiary of DTE Energy), charged in the ownership, operation and maintenance of Detroit Edison's transmission system. ITC would be fully spun off from Detroit Edison in April 2004, following a transition period that begun in December 2002. Detroit Edison was required to spin off ITC, in preparation for electric utility deregulation in Michigan.
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[edit] Michigan Electric Transmission Company
Michigan Electric Transmission Company (METC) is an ITC subsidiary in charge of the electric transmission system formerly owned by Consumers. METC was originally founded as a Consumers subsidiary, but was spun off in May 2002, following METC's acquisition by Trans-Elect, Inc. ITC would acquire METC in October 2006. Currently, both ITC and METC share the same headquarters in Novi.
[edit] Electric grid systems
[edit] Detroit Edison/ITC
Detroit Edison/ITC's transmission line voltages are 345,000 volts, 230,000 volts and 120,000 volts. Edison's subtransmission voltages are 40,000 volts and 24,000 volts.
Detroit Edison/ITC has three 345kV interconnections with First Energy Corporation in Ohio, via that company's Toledo Edison subsidiary (Bayshore-Monroe line, Majestic-Monroe-Allen Junction line, and the Majestic-Lemoyne line). Though owned by ITC as part of the Detroit Edison grid, these lines reside on towers designed by Consumers, as they pass through part of their service area in southern Monroe and southeastern Lenawee Counties.
There are interconnections with Hydro One in Ontario, Canada -- two 345kV (St. Clair-Lambton #1 and St. Clair-Lambton #2) and two 230kV (Keith-Waterman line and the Bunce Creek-Scott line).
[edit] Consumers/METC
The METC system uses line voltages of 345,000 volts and 138,000 volts. The subtransmission system voltages are 23,000 and 46,000 volts. Consumers retained radial 138 kV lines as well.
Consumers/METC has four 345KV interconnections with American Electric Power, via AEP's Indiana Michigan Power division: Palisades-Cook #1, Palisades-Cook #2, Argenta-Collingwood and Argenta-Irwin.
Consumers has six other 138kv interconnections with other utilities: one 138kv interconnection each with Northern Indiana Public Service Company (Barton-Batavia line) and Alpena Power Company; two with Edison Sault Electric Company in the eastern part of Michigan's Upper Peninsula (McGulpin-Straits #1 and McGulpin-Straits #2; these lines are submerged under the Straits of Mackinac); and two 138KV interconnections with the Lansing Board of Water & Light (Davis-Oneida line and the Davis-Holt line).
[edit] Interconnections between ITC and METC
There are four 345kV interconnections between the ITC and METC systems to the west of Detroit Edison's service area (Majestic-Tompkins line, Majestic-Battle Creek-Oneida line, Jewell-Thetford line, and the Pontiac-Hampton line), plus five 120/138kV interconnections (the Custer-Whiting line, Genoa-Latson line, Hemphill-Hunters Creek line, Washtenaw-Lark-Blackstone line and the Atlanta-Thetford-Karn line). Since Consumers' transmission voltage is 138kV, Detroit Edison has 120/138kV transformers in the substations on their end of the lines so that they can tie into Consumers' system.
