Tri-Valley Surpasses Year End Oil Production Rate Goals Six Months Ahead of Plan

Tri-Valley Corporation has exceeded 2,000 barrels of oil equivalent per day (BOED) rate with total field production recorded at 2,058.3 BOED from its 43 active producing wells on six California properties. This surpasses the original year end 2008 Company Plan of 2,000 BOED by more than six months.

“With tested productive capacity of individual wells now totaling over 3,500 BOED supporting our facilities expansion and installation planning, and many of the wells choked back during initial productive life for prudent early field development, we are now confident that we can achieve 3,000 BOED by year end, eclipsing our original Company Plan goal by 50%. Should additional drilling permits be obtained on a timely basis, and targeted lease acquisitions and subsequent developments proceed on schedule as expected, we believe we are on track to become a 10,000 BOED enterprise by the end of this decade,” said Robert Bell, vice president of operations for the operating subsidiary, Tri-Valley Oil & Gas Co.

The most recent production test was made to measure facilities capabilities in anticipation of establishing a stable production rate in the 2,000 BOED returning Tri-Valley to operating profitability and providing a platform for further ramp up of oil and gas production.

“Our team is working feverishly to procure and install increased facilities capacity in the appropriate properties to accommodate a steady build up of production in order to maximize benefits from this strong period of record high oil and natural gas prices,” said Joseph R. Kandle, Tri-Valley Oil and Gas Co. president. Significantly, Kandle noted that a newly acquired natural gas line would now begin delivering gas to fire the steam generators at the Company’s Pleasant Valley heavy oil project at a considerable savings over the propane cost which had been used initially. This one change alone will serve to substantially reduce the lifting cost and further enhance profitability from that project.

Commenting further on its recent strategic sale of some of the rig equipment of its Great Valley Production Services LLC subsidiary, Kandle noted that GVPS chose to keep its entire fleet of 17 steam generators to support accelerated growth of production from Tri-Valley’s heavy oil properties and some key personnel were kept to bolster staff support of increased oil production.

Some of Tri-Valley’s producing properties are shared with its TVOG Opus I Drilling Program LP while others are either partially owned with other partners or 100% owned by Tri-Valley.

“Thanks to outstanding performance by our technical and staff team, along with continued strong capital support from our Opus Drilling Program partners, and increasing petroleum prices, Tri-Valley is in the midst of mounting a tremendous and unprecedented growth phase. Our resources are focused to support this rapid growth to reward our shareholders and drilling partners. More than ever before we are in the right place at the right time with the right commodity and positioned for massive expansion,” said F. Lynn Blystone, president and chief executive officer.

Tri-Valley has been in business as a successful operating company since 1963, and has been a full reporting 12 (g) publicly traded Delaware Corporation since 1972. Tri-Valley Corporation stock is publicly traded on the American Stock Exchange under the symbol “TIV.” Our company website, which includes all SEC filings, is www.tri-valleycorp.com.

This press release contains forward-looking statements that involve risks and uncertainties. Actual results, events and performance could vary materially from those contemplated by these forward-looking statements which includes such words and phrases as exploratory, wildcat, prospect, speculates, unproved, prospective, very large, expect, potential, etc. Among the factors that could cause actual results, events and performance to differ materially are risks and uncertainties discussed in the company’s quarterly report on Form 10-Q for the quarter ended March 31, 2008, and the annual report on Form 10-K for the year ended December 31, 2007.

Contact:

Tri-Valley Corporation Egan Gost, Director of Public and Investor Relations 800-579-9314 information@tri-valleycorp.com

www.tri-valleycorp.com

Source: Tri-Valley Corporation