Edison Mission Energy filed for Chapter 11 reorganization in U.S. Bankruptcy Court in Chicago on Dec. 17. The unregulated generation unit of Rosemead-based Edison International listed $3.7 billion in unsecured debts in its bankruptcy filing. The debt apparently stemmed in part from recent losses in business for several of its Midwest coal plants, which have seen utility customers switch to cheaper natural gas. Edison Mission Energy now plans to cede its share of the cogeneration ventures to its creditors as part of the bankruptcy reorganization plan, according to documents filed as part of the Chevron affiliates' lawsuit and cited by the Bloomberg News story. "The prospect of an involuntary partnership, much less with uncertain or unqualified partners, is contrary to the law and abhorrent to plaintiffs," the Chevron affiliates said in their filing, as cited by Bloomberg News.