Newfield Exploration Co., Houston, (NYSE: NFX) plans to sell all of its interests in the U.K. North Sea to Centrica Plc, the owner of British Gas, for US$486.4 million, marking a complete exit by Newfield from the North Sea. The sale includes an 85% interest in the Grove Field, an 80% interest in the undeveloped Seven Seas discovery and an interest in approximately 200,000 net acres in the Southern Gas Basin producing approximately 240- to 253 billion cubic feet of gas equivalent.