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Power producer Southern to buy AGL Resources in $12B deal

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U.S. power producer Southern said Monday it will buy AGL Resources for about $8 billion in cash, creating the second-largest utility company in the country by customers.

AGL shareholders will get $66 for every share held, a 38 percent premium to the stock's Friday close.

The companies said in a release announcing the agreement that AGL would become a subsidiary of Southern. The transaction has an enterprise value of approximately $12 billion, including the total equity value of about $8 billion.

The combined entity will create the "leading" U.S. electric and gas utility, the companies said.

—CNBC's Everett Rosenfeld contributed to this report.