Energy Future Holdings, the bankrupt Texas power giant, is warning its restructuring plans could be put on hold if the IRS decides to pursue a more than $7 billion tax bill against the company.

EFH is planning to sell off the transmission company Oncor at auction early next year. And in court papers filed in U.S. Bankruptcy Court late Wednesday, EFH warned that could leave them on the hook for more than $7 billion in taxes and potentially squash the deal.

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