Westinghouse Advanced Energy Systems Division (AESD) was a research and development facility for nonconventional renewable energy systems, in the small town of Large in Allegheny County, Pennsylvania [USA]. The site is on the east side of Pa. Rte. 51, about 13 miles (21 km) south of Pittsburgh. Formerly the site of the Westinghouse Astronuclear Laboratory (WANL), Westinghouse Electric Corporation changed the name of the facility, along with its charter, in 1977.