In 2002, TCO produced , or one third of Kazakhstan's daily production. In January 2003, after contentious negotiations with the government of Kazakhstan, the TCO consortium members initiated a $3 billion expansion project designed to boost production to approximately by 2006. In September 2008, Chevron Corporation announced that the major expansion of Tengiz field was completed and it would boost the production capacity to . In 2012 Chevron announced the field will see its total daily production increase by 250,000-300,000 barrels, bringing production above 500,000 barrels per day.