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Sierra Geothermal Power Completes Drilling at Reese River, Nevada

Sierra Geothermal Power reported today that drilling has been completed at the company's Reese River Project, Lander County, Nevada. Well 56-4 was successfully drilled to a total depth of 1200 m (3930 ft). Testing for geothermal reservoir characteristics has now begun with results pending. The drilling program was operated by Sierra Geothermal's US subsidiary. Partial funding of US$580,000 was provided by the US Department of Energy's GRED III program.

The Reese River project is rated by Richards and Blackwell as one of the top 15 undeveloped geothermal prospects in Nevada (Source: Geothermal Resource Council, Bulletin March/April 2002, "The Forgotten Ones"). Phillips Petroleum and Amax Exploration drilled 52 temperature-gradient holes during the 1970's and 1980's. Contoured data of the temperature-gradient wells outline a 150 degrees C/km heat-flow anomaly that is approximately 4.8 km (3 miles) long in the northeast direction by approximately 1.6 km (1 mile) wide. The center of the anomaly reaches a temperature gradient of over 500 degrees C/km with an overall average of 225 degrees C/km. The maximum calculated heat flow at Reese River is 1117 mW/m2 (Amax 1998). Using a Monte Carlo simulation, the potential geothermal resource at Reese River was estimated to have a 90% probability of generating 13 MW and a 50% probability of exceeding 30 MW (Source: New Geothermal Site Identification and Qualification, PIER study prepared by GeothermEx, 2004). A 30 MW power plant is able to produce enough electricity to power 24,000 homes.

Sierra Geothermal has several projects located near the California-Nevada border. The State of Nevada and California have adopted a Renewable Portfolio Standard, which requires utilities to have 20% of their electricity supplied from renewable sources by 2015 and 2010 respectively.

Sierra Geothermal is a renewable energy company focused on the exploration and development of clean, sustainable geothermal power. Geothermal plants produce long-term revenues and provide continuous base-load power, often at or above 95% capacity. Sierra Geothermal recently acquired a large portfolio of geothermal projects. 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.

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