Petrobras Argentina S.A. operates as an integrated energy company. The company engages in the oil and gas exploration and production activities. As of December 31, 2011, it had interests in 39 blocks comprising 23 oil and gas production blocks and 16 exploration blocks; and approximately 223 million barrels of oil equivalent of crude oil and natural gas proved reserves. The company also operates refineries that produce gasoline, diesel oil, fuel oil, intermediate fuel oil mixes, asphalts, and liquefied gases. As of December 31, 2011, it operated a refinery; and a network of 278 gas stations. In addition, the company produces petrochemical products, such as styrene, polystyrene, and synthetic rubber; sells gas produced by the company, as well as imported gas; and provides oil, gas, and LPG brokerage and trading services. Further, it is involved in the transportation of gas in southern Argentina; processing and marketing of natural gas liquids; and the generation, transmission, and distribution of electricity. The company operates in Argentina, Bolivia, Brazil, Ecuador, Venezuela, and México. The company was formerly known as Petrobras Energía S.A. and changed its name to Petrobras Argentina, S.A. in July 2010. Petrobras Argentina, S.A. was founded in 1946 and is headquartered in Buenos Aires, Argentina. Petrobras Argentina, S.A. is a subsidiary of Petróleo Brasileiro S.A.