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This Dec. 13, 2010, file photo shows CMS Energy Corp.'s B.C. Cobb Plant in Muskegon, Mich. (Jeffrey Ball, The Muskegon Chronicle via AP) ** FILE **

This Dec. 13, 2010, file photo shows CMS Energy Corp.'s B.C. Cobb Plant in Muskegon, Mich. (Jeffrey Ball, The Muskegon Chronicle via AP) ** FILE **

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