EXHIBIT 21 LIST OF SUBSIDIARIES OF THE REGISTRANT Jurisdiction of Name Incorporation - ---- ------------- F&H Pipeline Company.............................................. Delaware Grant Gathering Company........................................... Delaware Vastar Holdings, Inc.............................................. Delaware Vastar Gas Marketing, Inc. ("VGM").............................. Delaware Vastar Power Marketing, Inc. ("VPM")............................ Delaware Vastar Energy, Inc. (VGM 99%; VPM 1%)......................... Delaware Vastar Offshore, Inc. ("VOI")..................................... Delaware Vastar Pipeline, LLC (VOI 100%)................................. Delaware Wilburton Hub, Inc................................................ Delaware