Webcast Alert: PXP Announces First Quarter 2006 Earnings Date and Conference Call/Webcast Information

HOUSTON, April 13 /PRNewswire-FirstCall/ -- Plains Exploration & Production Company announces the following earnings information:

What: First Quarter 2006 Earnings Results When: Earnings Release: Thursday, May 4, 2006 (before the market opens) Conference Call/Webcast: Thursday, May 4, 2006 at 2:00 p.m. Central Phone: Dial-in numbers: 1-800-567-9836 or 973-935-8460 Website: http://www.plainsxp.com/ How: Live over the Internet -- Simply log on to the web at the address above. Contact: Joanna Pankey, Investor Relations, Plains Exploration & Production Company, 1-713-579-6063 or 1-800-934-6083

A replay will be available through 5/18/06 and can be accessed by dialing 1-877-519-4471 or 1-973-341-3080. The replay ID is: 7262760. The call will be archived at http://www.plainsxp.com/.

PXP is an independent oil and gas company primarily engaged in the upstream activities of acquiring, developing, exploiting, exploring and producing oil and gas in its core areas of operation: onshore and offshore California, West Texas and the Gulf Coast region of the United States. PXP is headquartered in Houston, Texas.

(Minimum Requirements to listen to broadcast: The Windows Media Player software, downloadable free from http://www.microsoft.com/windows/windowsmedia/mp10/default.aspx and at least a 28.8Kbps connection to the Internet.)