DOW JONES NEWSWIRES 
 

Plains Exploration & Production Co. (PXP) plans to offer $300 million of 10-year senior notes, with proceeds targeted to help fund its agreement to help pay for drilling costs at its joint venture with Chesapeake Energy Corp. (CHK).

Chesapeake had disclosed plans to cut output at its Haynesville Shale joint venture in March, indicating more cuts were being weighed. Plains Chairman and Chief Executive James C. Flores in August said the venture agreement was amended to allow Plains to pay the remaining drilling costs on a discounted and accelerated basis.

Plains had agreed to fund half of Chesapeake's share of drilling and other costs up to $1.65 billion over several years. Under the amended pact, Plains agreed to pay $1.1 billion of an estimated $1.25 billion balance on Sept. 29. Chesapeake agreed to drill a minimum number of wells over a three-year period.

Plains is refocusing its efforts on the Haynesville Shale, a fast-growing natural-gas field in Louisiana and Texas, where the company bought a 20% stake from Chesapeake earlier this year. While giving Plains a major presence in the region, it also saddled it with debt and long-term costs.

Plains shares closed at $26.40 on Friday and didn't trade premarket. The stock has lost 39% of its value over the past year.

-By Tess Stynes, Dow Jones Newswires; 212-416-2481; tess.stynes@dowjones.com

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