 Stone & Webster, Inc., has since offered its customers in the United States and the world engineering, design, construction, consulting, and environmental services to build electric power plants, petrochemical plants and refineries, factories, infrastructure, and civil works projects.Stone & Webster helped build substantial portions of the nation's power production infrastructure, including coal, oil, natural gas, nuclear, and hydroelectric plants constituting around 20 percent of U.S. generating capacity.The company played a significant role in the nation's defense efforts during World War I and II and afterwards, helping develop the A-Bomb, constructing large shipyards, and creating alternate means of production of strategic materials such as synthetic rubber.