Exxon Mobil Corp. continues to be interested in developing a petrochemical complex in Qatar after Royal Dutch Shell Plc announced plans to help build a monoethylene glycol plant there. Earlier in January, Qatar Petroleum signed an agreement with Exxon Mobil for building a petrochemical complex at an estimated cost of about US$6 billion. It was to be the emirate's biggest single energy project since Shell's Pearl gas-to-liquids plant was announced in 2006. A Qatar Petroleum official said in August that Qatar might choose a different partner for that complex. The facility Exxon had planned was to include a 1.6 million-ton-a-year steam cracker, two 650,000 ton polyethylene plants and a 700,000 ton ethylene glycol unit. It was to be completed by 2015, Exxon and Qatar Petroleum said in January. Shell, the largest investor in Qatar, signed an agreement with state-run Qatar Petroleum to "jointly study" an estimated US$6 billion petrochemicals project.