HTM U.S. Geothermal Inc. (delisted)

U.S. Geothermal Inc. to Present at the Marcum MicroCap Conference on May 29th

BOISE, IDAHO--(Marketwired - May 21, 2014) - U.S. Geothermal Inc. (NYSEMKT:HTM)(TSX:GTH) a leading renewable energy company focused on the development, production, and sale of electricity from geothermal energy, is pleased to announce that Dennis Gilles, CEO, will be a featured presenter at the 3rd Annual Marcum Microcap Conference on Thursday May 29, 2014 in New York City at the Grand Hyatt Hotel. Mr. Gilles will present a corporate overview and business update highlighting the strong 2013 and first quarter 2014 corporate performance, as well as a summary of the exciting growth opportunities the company is pursuing.

The presentation is scheduled to begin at 9:00am EDT and will be webcast live and available for replay for up to 90 days using the following link http://wsw.com/webcast/marcum2/htm or on the home page of our corporate website www.usgeothermal.com.

The Annual Marcum MicroCap Conference is a signature showcase for superior quality, public companies with less than $500 million in market capitalization. For more information on the conference or to register, please visit the conference website at http://www.marcumllp.com/microcap.

About U.S. Geothermal Inc.:

U.S. Geothermal Inc. is a leading renewable energy company focused on the development, production and sale of electricity from geothermal energy and is operating geothermal power projects at Neal Hot Springs, Oregon, San Emidio, Nevada and Raft River, Idaho. In addition to the newly acquired Geysers development project, the company is currently developing a second phase project at San Emidio Nevada, as well as developing the El Ceibillo geothermal prospect located within a 24,710 acre (100sq km) energy rights concession area in Guatemala, located 8.5 miles (14 km) from Guatemala City, the largest city in Central America.

About The Marcum MicroCap Conference:

The Annual Marcum MicroCap Conference is a signature showcase for superior quality, under-followed public companies with less than $500 million in market capitalization. The Conference will allow institutional investors, sell-side analysts, and investment bankers the opportunity to consider the investment prospect being showcased by the next generation of up-and-coming microcap companies in seven industries. The Conference is expected to draw more than 1,000 attendees. For more information on the conference or to register, please visit the conference website at http://www.marcumllp.com/microcap. Marcum LLP is one of the largest independent public accounting and advisory services firms in the United States.

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. Readers are cautioned to review the risk factors identified by the company in its filings with US and Canadian securities agencies. All statements, other than statements of historical fact, included herein, without limitation, statements relating to the future operating or financial performance of U.S. Geothermal, are forward-looking statements. Forward-looking statements are frequently, but not always, identified by words such as "expects", "anticipates", "believes", "intends", "estimates", "potential", "possible", and similar expressions, or statements that events, conditions, or results "will", "may", "could", or "should" occur or be achieved. These forward-looking statements may include statements regarding perceived merit of properties; interpretation of the results of well tests; project development; resource megawatt capacity; capital expenditures; timelines; strategic plans; or other statements that are not statements of fact. Forward-looking statements involve various risks and uncertainties. There can be no assurance that such statements will prove to be accurate, and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from U.S. Geothermal's expectations include the uncertainties involving the availability of financing in the debt and capital markets; uncertainties involved in the interpretation of results of well tests; the need for cooperation of government agencies in the development and operation of properties; the need to obtain permits and governmental approvals; risks of construction; unexpected cost increases, which could include significant increases in estimated capital and operating costs; and other risks and uncertainties disclosed in U.S. Geothermal's Annual Report on Form 10-K for the year ended December 31, 2013 filed with the United States Securities and Exchange Commission and Canadian securities regulatory authorities and in other U.S. Geothermal reports and documents filed with applicable securities regulatory authorities from time to time. 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 NYSEMKT and the TSX do not accept responsibility for the adequacy of this release.

U.S. Geothermal Inc.Saf DhillonInvestor Relations866-687-7059208-424-1030saf@usgeothermal.comwww.usgeothermal.com