Georgia Power filed its own lawsuit over backfill in August, asking for a $29.3 million refund from the contractors. In this week's lawsuit, Westinghouse Electric Co. and a subsidiary of the Shaw Group say they should be paid for additional work that needed to be done to comply with federal regulatory changes in the project's design. They also want money to compensate for the utilities' 10-month delay in getting the main license to start heavy construction at Vogtle, in Waynesboro.