Warren Buffett's Berkshire Hathaway is buying the rest of its utility unit from the estate of a longtime board member who died three years ago, but it's not clear exactly how much it will pay for the 8% stake.

Under the leadership of its legendary chief executive officer, Warren Buffett, Berkshire Hathaway has become one of history's most successful companies and delivered stellar returns for long-term shareholders.

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Buffett was down on the utility industry's prospects in this year's letter to Berkshire Hathaway shareholders. But it's not clear what the current value of the utility divisions shares are today.

Warren Buffett's Berkshire Hathaway is buying the rest of its utility unit from the estate of a longtime board member Walter Scott Jr., who died three years ago.