Energy Future Holdings Corp., which was taken private in the largest leveraged buyout in history, posted a smaller third-quarter loss than a year ago quarter that included a massive write-down, even amid higher interest costs and lower sales.

In 2007, private-equity companies KKR & Co. LP (KKR) and TPG Inc. led a record-setting $45 billion leveraged buyout of the company, formerly known as TXU Corp. Since then, the large Texas power provider has struggled to manage its debt amid slumping power prices and a competitive …

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