Berry Petroleum Announces Expansion of Its Diatomite Heavy Oil Asset.

Appraisal drilling increased original oil in place by over 35% to 330 million barrels and production now expected to peak at 12,000 barrels per day 

DENVER -- Berry Petroleum Company (NYSE:BRY) announced today that it is increasing its estimate of original oil in place in its diatomite asset by over 35% to 330 million barrels. During 2008, Berry drilled six delineation wells in the northern portion of the field. These wells encountered a 300 feet to 400 feet thick oil column with reservoir characteristics similar to Berry's current diatomite development. As a result, Berry anticipates drilling an additional 230 wells and now expects production from this project will increase to over 12,000 barrels per day by 2015.

Robert Heinemann, president and chief executive officer, stated, "These appraisal results have enabled us to expand our portfolio of low geologic risk, high-return oil projects. Our diatomite project continues to add significant long term oil production growth that will create value for our shareholders. Finding and development costs are expected to be between $6.00 and $8.00 per barrel. Assuming a steam oil ratio of 6 to 1 and a natural gas price of $7.50 per MMBtu, operating cost should be approximately $25 per barrel. At a $100 WTI price, this project is delivering exceptional rates of return and this latest addition to the overall project should add 19 million barrels of risked reserves to our resource base, assuming an ultimate recovery of 23%. Our existing diatomite development continues to deliver solid results with current production averaging 2,300 barrels per day and we expect to exit 2008 at 3,000 barrels per day."

Presentation at the Oil and Gas Conference - Denver

Berry will be making a presentation on Thursday, August 14, 2008 at 5:10 p.m. ET (3:10 p.m. MT) at the Oil and Gas Conference in Denver, CO. The presentation will be webcast live and will be available for replay on the Company's website. You may view the webcast by clicking: http://phx.corporate-ir.net/phoenix.zhtml?c=85544&p=irol-EventDetails& EventId=1908767 (Due to its length, this URL may need to be copied/pasted into your Internet browser's address field. Remove the extra space if one exists.)

About Berry Petroleum Company

Berry Petroleum Company is a publicly traded independent oil and gas production and exploitation company with operations in California, Colorado, Texas and Utah.

Safe harbor under the "Private Securities Litigation Reform Act of 1995"

Certain statements in this news release, including but not limited to statements regarding the closing of the acquisition and credit facility, and other statements that are not historical facts, are forward-looking statements that involve risks and uncertainties. Although Berry believes that its expectations are based on reasonable assumptions, it can give no assurance that these expectations will prove correct. Important factors that could cause actual results to differ materially from those in the forward-looking statements include our results of operations, general market conditions, satisfaction of the purchase agreements' and credit facility's closing conditions and other risks described in PART 1, Item 1A. Risk Factors of Berry's 2007 Form 10-K/A filed with the Securities and Exchange Commission on February 27, 2008 under the heading "Other Factors Affecting the Company's Business and Financial

Results" in the section titled "Management's Discussion and Analysis of Financial Condition and Results of Operations" and all material changes as updated in Part II, Item 1A within our Form 10-Qs filed subsequent to the Form 10-K/A. Words such as "plans," "will," "expect," "target," "goal," and forms of those words and others indicate forward-looking statements.