Enap Refinerías S.A., the refining subsidiary of Chile's state oil company Enap, engages in the processing and production of fuel and oil products, as well as logistics infrastructure activities related to the transportation and storage of hydrocarbons products, such as gasoline and diesel and other oil products, including products for manufacturing of asphalt and ethylene. Its assets include the Aconcagua and Bío Bío refineries, located in Valparaíso region (V) and Biobío region (VIII), respectively, as well as the companies Petrosul, Energía Concon, Productora de Diesel and Compañía de Hidrógeno del Bío Bío. The company was created in 2004 after the merger of the units Petrox and Refinería de Petróleo Concón. In 2013 it sold its 49% indirect stake in Peruvian retail fuel distributor Primax to fellow Peruvian multi-sector holding Grupo Romero. Its corporate office is located in the municipality of Concón, region V.