U.S. Geothermal Inc. Updates El Ceibillo Project; Drilling Commences

U.S. Geothermal Inc. Updates El Ceibillo Project; Drilling Commences 
BOISE, IDAHO -- (Marketwired) -- 04/30/13 -- U.S. Geothermal Inc.
(TSX:GTH)(NYSE MKT:HTM), a leading renewable energy company focused
on the development, production, and sale of electricity from
geothermal energy, announced today that its wholly owned subsidiary,
U.S. Geothermal Guatemala, S.A., started drilling well EC-1 at the El
Ceibillo Project on April 29. Well EC-1 is planned for a depth of up
to 1,000 meters (3,280 feet). 
Well EC-1 is located approximately 114 meters (374 feet) from well
B-7, a well drilled in 1999 that had a bottom hole temperature of 202
degrees C (396 degrees F) at 200 meters (656 feet) deep. In advance
of finalizing the location for well EC-1, two geophysical surveys
were completed during January and February that provided more
detailed targeting information. A 262 station gravity survey,
covering 2.2 square kilometers (.85 square miles), was conducted by
MWH Geophysics of Reno, Nevada and a 12 station VES (Vertical
Electrical Survey) was conducted by Sinergia of Guatemala City,
Guatemala. Site work started on the project in January, with
construction of an on-site office, property fencing, drill pad and
test ponds. 
An environmental study report "Construction and Operation of the
Geothermal Electric Plant, El Ceibillo" was submitted to Guatemala's
Ministry of Environment and Natural Resources in late December 2012.
This report was submitted in compliance with the concession contract
for the geothermal rights granted by the Ministry of Energy and Mines
in April 2010, and with the Electrical Law and Regulation of
Guatemala. The report was prepared by Eco-Servicios Integrados of
Guatemala City, Guatemala. 
The report underwent a public comment period which ended on January
29, and is now under formal review by the Ministry Of Environment and
Natural Resources. No comments were received during the public
comment period. Upon approval, an Environmental License will be
issued that will allow the project to proceed with power plant
construction and operation. 
"We are very excited to begin development drilling on the El Ceibillo
project in Guatemala," said Dennis Gilles, CEO of U.S. Geothermal.
"With three operating power plants in the United States now providing
positive EBITDA, net income, and cash flow, we expect that the
development of El Ceibillo will be a strong contributor to the next
stage of growth for our company. The government of Guatemala strongly
supports renewable energy, and we look forward to working with them
to make the development of this first, 100% private geothermal
concession a big success." 
Please visit our Website at: http://www.usgeothermal.com 
About U.S. Geothermal Inc.: 
U.S. Geothermal Inc. is a leading renewable energy development
company that is operating geothermal power projects at Raft River,
Idaho, San Emidio, Nevada, and Neal Hot Springs Oregon. El Ceibillo
is an advanced stage, high temperature development project located in
Guatemala. The company holds geothermal energy rights to 69,500 acres
comprising six advanced stage geothermal development projects. 
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. 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, including but not limited to, the results from the
exploration, production and injection well drilling at El Ceibillo.
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 NYSE MKT and the TSX do not accept responsibility for the
adequacy of this release. 
U.S. Geothermal Inc.
Saf Dhillon
Investor Relations
208-424-1030 (FAX)
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