U.S. Geothermal Inc.
TSX : GTH
AMEX : HTM

U.S. Geothermal Inc.

June 26, 2008 09:02 ET

U.S. Geothermal Set to Join the Russell 3000 Index

BOISE, IDAHO--(Marketwire - June 26, 2008) - U.S. Geothermal Inc. (TSX:GTH)(AMEX:HTM) ("U.S. Geothermal"), a renewable energy company focused on the production of clean, renewable electricity from geothermal energy, is pleased to announce today that it is set to join the broad-market Russell 3000® Index when Russell Investments reconstitutes its comprehensive set of U.S. and global equity indexes on June 27, according to a preliminary list of additions posted on www.russell.com.

Annual reconstitution of Russell's U.S. indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. Membership in the Russell 3000, which remains in place for one year, means automatic inclusion in the large-cap Russell 1000® Index or small-cap Russell 2000® Index as well as the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market-capitalization rankings and style attributes.

"As a clean, green, energy company working toward energy security, it is gratifying to both shareholders and employees that U.S. Geothermal become part of the Russell 3000 Index," said John Walker, Chairman of the Board of U.S. Geothermal. He went on to say, "Geothermal power generation is a proven, sustainable form of energy that has little or no green house gas emissions, and provides power to the grid 24 hours a day. It is the most reliable form of renewable energy."

The Russell 3000 also serves as the U.S. component to the Russell Global Index, which Russell launched last year.

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. An industry-leading $4.4 trillion in assets currently are benchmarked to them. These investment tools originated from Russell's multi-manager investment business in the early 1980s when the company saw the need for a more objective, market-driven set of benchmarks in order to evaluate outside investment managers.

Real-time market analysis on the Russell 3000 and other Russell Indexes is available at http://www.russell.com/Indexes/performance/real_time_market_analysis.asp.

About Russell:

Russell Investments aims to improve financial security for people by providing strategic advice, world-class implementation, state-of-the-art performance benchmarks, and a range of institutional-quality investment products. With more than $213 billion in assets under management, Russell serves individual, institutional and advisor clients in more than 40 countries. Russell provides access to some of the world's best money managers. It helps investors put this access to work in corporate defined benefit and defined contribution plans, and in the life savings of individual investors. Headquartered in Tacoma, Wash., Russell has principal offices in Amsterdam, Auckland, Johannesburg, London, Melbourne, New York, Paris, San Francisco, Seoul, Singapore, Sydney, Tokyo and Toronto.

For more information on Russell indexes, go to www.russell.com.

About U.S. Geothermal:

U.S. Geothermal is a renewable energy company that operates two geothermal power plants; Raft River in Idaho and San Emidio in Nevada. There are five projects under development or exploration that are located in Idaho, Nevada, and Oregon.

The information provided in this news release may contain forward-looking statements within the definition of the Safe Harbor provisions of the US Private Securities Litigation Reform Act of 1995, including statements regarding potential energy resources and projects, development possibilities for Raft River, San Emidio and Neal Hot Springs. These statements are based on U.S. Geothermal Inc.'s current expectations and beliefs and are subject to a number of risks and uncertainties that can cause actual results to differ materially from those described. Readers are cautioned to review the risk factors identified by the company in its filings with Canadian and US securities agencies. Forward-looking statements are based on management's expectations, beliefs and opinions on the date the statements are made. U.S. Geothermal Inc. assumes no obligation to update forward-looking statements if management's expectations, beliefs, or opinions, or other factors, should change.

The American Stock Exchange and the TSX do not accept responsibility for the adequacy of this release.

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