A North Carolina appeals court upheld Tuesday the state's regulatory approval of the deal that made Duke Energy Corp. the country's largest electric company when it purchased Progress Energy.

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North Carolina's Attorney General Roy Cooper said Friday he would challenge an electricity rate increase taking effect Saturday that will cost the average home an extra $88 a year.

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Critics of a rate increase for Progress Energy customers are questioning deals that would give the utility's largest customers breaks on the costs.

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North Carolina utilities regulators have ordered Duke Energy and Progress Energy to detail some of the deals they cut with major customers before their merger earlier this year.

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