A federal grand jury was set to convene Tuesday as part of a widening criminal investigation triggered by the massive Duke Energy coal ash spill that coated 70 miles of the Dan River with toxic sludge.

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Documents and interviews collected by The Associated Press show how Duke's lobbyists prodded Republican legislators to tuck a 330-word provision in a regulatory reform bill running nearly 60 single-spaced pages. Though the bill never once mentions coal ash, the change allowed Duke to avoid any costly cleanup of contaminated groundwater leaching from its unlined dumps toward rivers, lakes and the drinking wells of nearby homeowners.

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Internal emails between staff at North Carolina's environmental agency show state regulators were coordinating with Duke Energy before intervening in efforts by citizens groups trying to sue the company over pollution leeching from its coal ash dumps.

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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 regulators have cited five more Duke Energy power plants for lacking required storm water permits after a pipe collapse at one of the company's coal ash dumps caused a massive spill, coating 70 miles of the Dan River in toxic sludge.

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North Carolina's top environmental official says he briefed Gov. Pat McCrory about a negotiated settlement with Duke Energy that would have fined the $50 billion corporation $99,000 to resolve violations for groundwater contamination leaching from two huge coal ash dumps.

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The settlement of a complicated, internecine $1.2 billion lawsuit has signaled the end of any relationship between two once-synonymous giants of economic development in Charlotte. But the Jan. 7 dismissal in a Texas court of a 2010 suit brought by ...

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Duke Energy Corp. is joining a growing list of corporations scrapping long-held practices of providing retirees with health insurance and giving former workers a fixed amount to buy their own supplement to Medicare coverage.

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North Carolina's highest court has overturned a substantial rate hike sought by Duke Energy and approved by state utilities regulators.

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Duke Energy will not be repaid a $10 million line of credit it guaranteed the city of Charlotte to host the Democratic National Convention last year.

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