NextEra Energy Inc.  and a group of Energy Future Holdings Corp. creditors revised a restructuring proposal that would give the Florida utility control of Energy Future’s profitable Oncor unit.

The new offer would increase the valuation of Oncor by $500 million, NextEra and investors holding second-lien notes issued by Oncor’s parent company said yesterday in a filing in U.S. Bankruptcy Court in Wilmington, Delaware.

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