U.S. BRIEFS

MOBIL CHEMICAL CO. placed on stream added polystyrene capacity of 120 million lb/year at its Joliet, Ill., plant (OGJ, July 3, 1989, p. 20), bringing total plant capacity to 480 million lb/year and Mobil's total U.S. polystyrene capacity to 625 million lb/year. PANDA ENERGY CORP., Dallas, plans a $200 million, gas fired cogeneration plant in Prince George's County, Md. Panda signed a contract to supply Potomac Electric Power Co., Washington, D.C., 230,000 kw of electricity from the