Cohen Research Issues Comprehensive Report on Tri-Valley with a "Buy Recommendation".

BAKERSFIELD, Calif. -- Cohen Independent Research Group, Wall Street's number one independent research firm, has issued a 139-page research report recommending purchase of Tri-Valley Corporation (AMEX:TIV). Known for its in-depth analysis, the report recommends TIV as a buy for long-term growth and Cohen Research stated the following:

"We believe Tri-Valley's strategy to re-exploit and further develop, with modern methods, its lightly drilled properties, provides investors with a special opportunity. The Company's asset base places it in the enviable position of having high impact prospects adjoining prolific oil fields. Also, its inventory of large target wildcat exploration prospects enables the Company to pursue 'Company maker' projects as well and evaluate numerous attractive options. These are bolstered by the Company having its own fleet of production and drilling rigs. We believe management has the ability to oversee these assets and increase long-term revenues. Going forward, revenues and profits are expected to be enhanced on a site-by-site basis. The reward is the conversion of a market risk asset to a credit risk asset, and the commensurate increase in value of the assets involved. We believe Tri-Valley's production plans are exciting in an opportunity-oriented industry. At $7.15 per share, with a $30.03 long term valuation target, we recommend purchase of Tri-Valley's common stock for long term, moderate risk investors."

Tri-Valley recently initiated re-work of 49 producing wells and has already begun drilling new wells with its own recently acquired drilling and production rigs on its Temblor Valley lease adjoining the billion barrel South Belridge Oil Field some 40 miles west of Bakersfield, California and has commenced operations to drill its first development well on its Pleasant Valley property in the Oxnard Oil Field south of Ventura, California. The Company is finalizing plans for development of several natural gas properties in central California.

"Our technical staff is to be commended for assembling such an asset platform to build production, revenue, reportable reserves and share value. We appreciate the work done by Cohen Research Group to identify the leverage available for our shareholders and drilling partners," said F. Lynn Blystone, president and chief executive officer.

Blystone noted that the Company had spent the past two years assembling the assets including rigs to assure implementation of the plan and has launched the drilling and well workovers to increase production. The Company retained Cohen Research for a fee of $28,500 to analyze its operations and potential for its shareholders and the investment community. Cohen Research Group has no connection with the Company's American Stock Exchange market maker, Cohen Specialists LLC. The Company expects to substantially augment its capital formation activities in the least dilutive way to accelerate drilling and exploitation activity to add and exceed the values Cohen Research has projected.

The Company is in its 44th year of business as a successful operating company and for 33 years has been a full reporting 12 (g) publicly traded Delaware Corporation. Tri-Valley Corporation stock is publicly traded on the American Stock Exchange under the symbol "TIV" in the United States and is also traded in Europe on the Frankfurt Stock Exchange under the symbol "TVC WKN 911919." Our company websites, which include all SEC filings, are www.tri-valleycorp.com and www.tri-valley.de.

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 June 30, 2006, and the annual report on Form 10-K for the year ended December 31, 2005.