Tri-Valley Lists Stock on the Frankfurt Stock Exchange.

Business Editors

BAKERSFIELD, Calif.--(BUSINESS WIRE)--June 27, 2003

In addition to its listing on Europe's oldest stock exchange in Berlin, Tri-Valley Corporation (OTCBB:TRIL) stock is now listed on the larger Frankfurt Stock Exchange. Both exchanges use the symbol TVC WKN 911919.

Tri-Valley Corporation initiated these listings in response to an increasing number of European investors in its drilling projects and its stock as an accommodation for trading in those time zones.

In the United States, the Company's stock trades on the over-the-counter Bulletin Board under the symbol TRIL. The Company has also applied for listing on the American Stock Exchange.

In its 40th year as a successful operating company in United States oil and gas exploration and production, Tri-Valley has assembled the largest, highest upside oil and gas exploration opportunity in the United States available to private investors today. This program coincides with the emerging natural gas shortage noted by Federal Reserve Banking Chairman, Alan Greenspan, in recent testimony before Congress and by Department of Energy Secretary, Spencer Abraham, in his emergency meeting last Thursday.

"We saw this coming some years ago and began positioning Tri-Valley to be in the right place, at the right time, with the right commodities and the right program for investors to access this opportunity. No other company is doing something of a magnitude akin to what Tri-Valley is doing and the doubling of the oil price and tripling of the gas price of our original scenarios offer a bonanza premium to our investors on discovery success," said F. Lynn Blystone, Tri-Valley Corporation president and chief executive officer.

"Exploration for big, new reserves is high risk and conditions have arrived that can make the risk very worthwhile. After all in our country, the responsibility for replacing the reserves of the nation, if not increasing them, is left to the private sector. That means investors who have stayed away from oil and gas exploration will now return for the exceptional upside potential and we have a massive program established for them to access this national opportunity," Blystone stated.

The Company and its subsidiaries are headquartered in Bakersfield, California, a premier oil-producing province of the western hemisphere. 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 March 31, 2003, and the annual report on Form 10-K for the year ended December 31, 2002.