The southern African country is banking on the project to bring in billions more dollars as it diversifies its energy industry.

"Construction of the factory is scheduled to take four years and the first exports of LNG should start in the fourth quarter of 2011," said Antonio Orfao, president of state-owned Sonangol Gas Natural, which is overseeing the project.

He told Reuters in an interview today that the first LNG exports were targeted for the North American market.

Angola,