Chinas national Oil companies are currently planning or building several new refineries and upgrading existing plants. In July 2006, PetroChina completed the expansion of its Dalian refining center, raising the plants capacity from 210,000 bbl/d to 410,000 bbl/d, making it the largest refinery in China. Also in July 2006, Sinopec completed the construction of a new 160,000-bbl/d refinery at Hainan. The unit is expected to begin commercial operations by year-end 2006, and will be capable of producing diesel and Gasoline that meets Euro III standards. In May 2006, Sinopec finished an upgrade at its Guangzhou refinery, increasing the systems capacity from 154,000 bbl/d to 260,000 bbl/d and adding additional petrochemical units.