HOUSTON, July 1 (Reuters) - The cost to finish building Southern Co's controversial coal-gasification power plant in Kemper County, Mississippi, may increase by at least $160 million to $4.5 billion or more, or more than double initial cost estimates, the company said in a filing with regulators. Separately, the utility last week filed a petition asking state regulators to hold a "prudency review" to approve all money spent on the Kemper project...
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