Stewart & Stevenson Services, Inc., announced that the company's Distributed Energy Solutions Division in Houston has successfully completed production and testing on four high voltage emergency generator sets for the U.S. Navy's next nuclear aircraft carrier. Delivery of the first pair was made in May of 2003 and the second pair is more than a year ahead of schedule. The Nimitz Class carrier, originally designated CVN77 and later named the USS George H.W. Bush in a Pentagon ceremony in early December 2002, is under construction at Northrop Grumman Newport News in Virginia. The carrier will rely on backup power provided by Emergency Diesel Generator (EDG) sets produced by Stewart & Stevenson.