PRESS RELEASE

Synthesis Energy Systems Appoints Charles Costenbader as

Chief Financial Officer

HOUSTON, September 4, 2013 -- Synthesis Energy Systems, Inc. (NASDAQ: SYMX) ("SES") has appointed Charles Costenbader, 53, as chief financial officer. He reports to Robert Rigdon, president and CEO.

Mr. Costenbader has 25 years of experience in energy-related finance. In his most recent position with Tangent Energy Solutions, Inc., he was responsible for project financing activities regarding power generation projects and hedging structures for environmental credits and power.

Previously, Mr. Costenbader was with Macquarie Bank Limited in the power and natural gas commodities division in Houston from 2007 to 2011 and 2004 to 2006. He sourced and structured energy asset opportunities for investment and commodity risk management services. Additionally, Mr. Costenbader has previous chief financial officer experience with Galveston Bay Biodiesel, L.P. From 1989 to 1998, he served as vice-president in the Structured Finance Group of GE Capital where he was responsible for underwriting and managing investments in the energy, natural gas storage, methanol refinery, and pulverized coal sectors.

Mr. Costenbader graduated from Lafayette College in Easton, Pennsylvania with a BS degree in mechanical engineering and received an MBA in finance and operations management from Columbia University. He serves on the board of directors of Coalview Ltd. He has a professional engineer license, some proficiency in Mandarin, and fluency in German.

“Charlie brings important experience, knowledge and relationships to SES as we continue to pursue our ‘capital-lite’ strategy based on commercial and financial partnerships through which we intend to commercialize our technology globally,” said Robert Rigdon, president and CEO, SES. “As a seasoned financial professional in the energy industry, we look forward to his coming on board and expect that he will be a significant contributor, helping us accelerate the growth of the company and grow value for our shareholders.”

About Synthesis Energy Systems, Inc.

SES provides technology, equipment and engineering services for the conversion of low rank, low cost coal and biomass feedstocks into energy and chemical products. Its strategy is to create value through providing technology and equipment in regions where low rank coals and biomass feedstocks can be profitably converted into high value products through its proprietary U-GAS^® fluidized bed gasification technology, which SES licenses from the Gas Technology Institute. U-GAS^® gasifies coal cost effectively, without many of the harmful emissions normally associated with coal combustion plants. The primary advantages of U-GAS^® relative to other gasification technologies are (a) greater fuel flexibility provided by the ability of SES to use all ranks of coal (including low rank, high ash and high moisture coals, which are significantly cheaper than higher grade coals), many coal waste products and biomass feed stocks; and (b) the ability of SES to operate efficiently on a smaller scale, which enables the construction of plants more quickly, at a lower capital cost, and, in many cases, in closer proximity to coal sources. SES currently has offices in Houston, Texas, and Shanghai, China. For more information on SES, please visit www.synthesisenergy.com or call (713) 579-0600.

SES Forward-Looking Statements

This press release includes "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical fact are forward-looking statements. Forward-looking statements are subject to certain risks, trends and uncertainties that could cause actual results to differ materially from those projected. Among those risks, trends and uncertainties are the development stage of the operations of SES, its estimate of the sufficiency of existing capital sources, its ability to successfully develop its licensing business, its ability to raise additional capital to fund cash requirements for future investments and operations including its China platform initiative, its ability to reduce operating costs, the limited history and viability of its technology, commodity prices and the availability and terms of financing opportunities, its results of operations in foreign countries, its ability to diversify, its ability to complete the restructuring of the ZZ joint venture, its ability to obtain the necessary approvals and permits for future projects, the estimated timetables for achieving mechanical completion and commencing commercial operations for the Yima project as well as the ability of the Yima project to produce revenues and earnings, the sufficiency of internal controls and procedures, its ability to grow its business and generate revenues and earnings as a result of its proposed China and India platform initiatives as well as its joint venture with Midas Resource Partners, and its ability to develop its power business unit and marketing arrangement with GE and its other business verticals, steel and renewables. Although SES believes that in making such forward-looking statements its expectations are based upon reasonable assumptions, such statements may be influenced by factors that could cause actual outcomes and results to be materially different from those projected. SES cannot assure you that the assumptions upon which these statements are based will prove to have been correct.

Contact:

Synthesis Energy Systems, Inc.

Kevin Kelly

Chief Accounting Officer

(713) 579-0600

Kevin.Kelly@synthesisenergy.com

MBS Value Partners, LLC

Matthew D. Haines (Investors)

Managing Director

(212) 710-9686

Matt.Haines@mbsvalue.com

Feintuch Communications (Media)

Richard Anderson

Senior Managing Director

(718) 986-1596

SES@feintuchpr.com