Duke Energy has reached a settlement with the North Carolina Attorney General, the Sierra Club and Public Staff of the North Carolina Utilities Commission over coal-ash cleanup costs. The settlement stems from the parties’ appeal of a Utilities Commission decision that would have allowed Duke to pass on almost all costs. The deal will save ratepayers more than $1.1 billion in costs between 2015 and 2030, according to a statement from the state Attorney General’s office. It cuts the amount customers would have to pay by 60%, according to Duke Energy. The utility is currently in the process of closing out its remaining coal ash basins in the state as part of a prior, separate settlement. The total cost for the cleanup could be up to $9 billion, the utility has said.