June 19, 2008

Sierra Geothermal Power Ranked in the Top 10 in the TSX Venture Exchange’s Clean Tech Sector

Sierra Geothermal Power Corp. (SGP) (TSX VENTURE:SRA), a renewable energy company focused on the exploration and development of geothermal resources, has been chosen by the TSX Venture Exchange as one of the top emerging public companies in the clean tech sector in the third annual TSX Venture 50.

SGP was ranked eighth of the top 10 performers in the clean tech industry and was recognized as a company that is setting the bar in the sector.

"It is a great honour to be listed as one of Canada's top emerging companies in 2007," said Gary R. Thompson, President and CEO. "I want to congratulate our board members, management team and employees, and thank our investors for their part in this remarkable achievement."

About TSX Venture 50

The TSX Venture 50 is a ranking of Canada's top emerging public companies listed on the TSX Venture Exchange. It includes the top 10 companies in each of five major industry sectors, including Mining, Oil & Gas, Technology/Life Sciences, Clean tech and Diversified Industries, based on a ranking formula with equal weighting given to one-year revenue, return on investment, market cap growth and trading volume.

About Sierra Geothermal Power Corp.

SGP is a Vancouver-based renewable energy company focused on the exploration and development of clean, sustainable geothermal power. Geothermal power plants produce long-term stable revenues and provide continuous base-load power, often at or above 95% capacity. SGP's 17 projects comprise a total of 88,000 acres of geothermal land assets in Nevada and California. The company intends to advance the development of its portfolio of projects through a combination of equity and/or joint ventures, while continuing to evaluate additional acquisitions. To find out more about Sierra Geothermal Power Corp. (TSX VENTURE:SRA) visit our website at www.sierrageopower.com.

On behalf of the Board of Directors,

Gary Thompson, President & CEO

This news release contains forward-looking statements that are subject to certain risks and uncertainties that may cause actual results to differ materially from those projected on the basis of such forward-looking statements. Such forward-looking statements are made based upon management's beliefs, as well as assumptions made by, and information currently available to, management pursuant to the "safe-harbor" provisions of the Private Securities Litigation Reform Act of 1995.

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