US-based Apache Corporation has been one of the most long-term oil and gas investor in Western Australia. However, in 2014 it moved to liquidate most of its local holdings.
In December 2014, Woodside Petroleum agreed to purchase Apache Corporation’s interests in the Wheatstone and Balnaves projects for $US2.82 billion ($A3.71 billion).
In April 2015, Macquarie Capital and Brookfield Asset Management agreed to buy Apache Corporation's Australian oil and gas operations for $US2.1 billion ($A2.7 billion), with the deal underpinned by a long-term gas sale agreement with Alcoa.
Among its remaining assets is a 49% stake in Yara Pilbara Holdings which owns the Burrup liquid ammonia plant.