Nippon Oil
By late 2003, Japan Energy Corporation was part of a consortium that began exploring the natural gas field off the Aomori coast. In 2010, Nippon Mining merged with Nippon Oil to become JX Holdings, and the petroleum assets of both Japan Energy and Nippon Oil were reorganized into two companies, JX Nippon Oil &amp; Energy and JX Nippon Oil &amp; Gas Exploration.