Nevada Geothermal and Sierra Geothermal Amend Pumpernickel Property Option Agreement

VANCOUVER, BRITISH COLUMBIA, Jan 15 (MARKET WIRE) --
Nevada Geothermal Power Inc. (NGP) (TSX VENTURE: NGP)(OTCBB: NGLPF) is
pleased to announce that Sierra Geothermal Power Corp. (SGP) on December
12, 2007 it signed an amendment to the option agreement to revise the
earn-in schedule with NGP for the Pumpernickel geothermal land. The
original option agreement was entered into on October 12, 2004 and
amended on February 14, 2006. To date SGP has issued 400,000 shares of
stock and forwarded C$1,000,000 to Nevada Geothermal for Pumpernickel.

In order to earn-in the 50% joint venture interest in the Pumpernickel
geothermal land, SGP is required to make remaining cash payments and to
issue stock as follows: (a) pay NGP $70,000, (b) incur exploration and
development expenditures totaling $4,000,000 and (c) issue 200,000 common
shares of SGP to NGP by December 15, 2008.

The Pumpernickel property is operated by NGP and is located in Humboldt
County, Nevada. Pumpernickel project has produced reservoir temperature
estimates from 150 degreesC (302 degreesF) to 218 degreesC (424
degreesF). Future work will include temperature gradient wells, a full
size production test well, transmission studies and feasibility studies.
The Pumpernickel site is estimated to contain a 20 - 30 megawatt resource
enough electricity to power 24,000 homes.

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 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.

About Nevada Geothermal Power Inc.

Nevada Geothermal Power Inc. is a renewable energy company developing
geothermal projects in the United States to provide electrical energy
that is clean, renewable and sustainable. NGP currently owns a 100%
leasehold interest in four properties: Blue Mountain that is expected to
commence power generation late 2009 for up to 35 MW of geothermal power,
Pumpernickel, Black Warrior, all located in Nevada and Crump Geyser in
Oregon.

Nevada Geothermal Power Inc.

Brian D. Fairbank, P. Eng., President & CEO

This Press Release contains certain forward-looking statements within the
meaning of the Private Securities Litigation Reform Act of 1995. We have
tried, whenever possible, to identify these forward-looking statements
using words such as "anticipates", "believes", "estimates", "expects",
"plans", "intends", "potential", and similar expressions. These
statements reflect our current belief and are based upon currently
available information. Accordingly, such forward-looking statements
involve known and unknown risks, uncertainties and other factors which
could cause the Company's actual results, performance or achievements to
differ materially from those expressed in or implied by such statements.
We undertake no obligation to update or advise in the event of any
change, addition, or alteration to the information catered in this Press
Release including such forward-looking statements.

TSX Venture Exchange does not
accept responsibility for the adequacy or accuracy of this release.

Contacts:
Nevada Geothermal Power Inc.
Shelley Kirk
(604) 688-1553 X118 or Toll Free: 866-688-0808 X118
Email: sfkirk@nevadageothermal.com
Website: www.nevadageothermal.com

Pro-Edge Consultants Inc.
Tracy Weslosky or Fred Cowans
Managing Partners
(416) 581-0177 or Toll Free: 1-866-544-9622
Email: info@pro-edge.com
Website: www.pro-edge.com

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