Energy Future Holdings can move ahead on breaking up the company, a federal judge ruled Thursday, setting the stage for Texas' largest power company to emerge from bankruptcy court in the spring. U.S. Bankruptcy Judge Christopher Sontchi found Energy Future's plan to hand its power plants and retail business TXU Energy to creditors and sell the power line business Oncor to an investors' group led by Dallas billionaire Ray L. Hunt represented the best option for both the company and all its creditors.