XNL Xethanol Corp.

Xethanol Corporation (AMEX: XNL), a diversified renewable energy company, today announced that Dr. Thomas Jeffries addressed the Fuel Ethanol Workshop in Nashville, Tennessee this morning to report on his research sponsored by Xethanol. Dr. Jeffries, a Professor at the University of Wisconsin-Madison, conducts research at the Forest Products Laboratory of the U.S. Department of Agriculture in Madison. Dr. Jeffries spoke on fermentation of cellulose and hemicellulose from corn waste. His Xethanol-sponsored research at the Forest Products Lab focuses on the reduction of the net cost of renewable fuel made from wood and agricultural waste. During his presentation, Dr. Jeffries discussed the key advantages of why ethanol produced from agricultural (corn) residues is more energy efficient than ethanol produced from corn grain alone. Key points of his speech discussed the benefits that farmers can realize from this process. For example, residues can be recovered with little additional energy input, and the sale of agricultural residues can provide farmers with additional income. In addition, Dr. Jeffries elaborated on the pretreatments to recover sugars that are becoming available, along with several technologies using sulfuric, sulfurous, or oxalic acids ethanol and other products that can be made from the hemicellulosic sugars. Commercial enzymes are also available to recover sugar from the pretreated residue with cellulases and xylanases release fermentable sugars yielding a total sugar from corn waste approaching 90%. David Ames, Xethanol�s CEO commented, �We are pleased with the progress that Dr. Jeffries and his team are making. Although production of ethanol from cellulosic by-products has been possible for many years, cost efficiently producing ethanol in this manner has been the challenge. Dr. Jeffries� work is moving us closer to that goal.� Xethanol-sponsored researchers at the Forest Products Lab have developed yeasts that ferment xylose and cellulose to ethanol using a native xylose fermenting yeast that can be employed commercially without environmental concerns, more than doubling the fermentation rate by engineering a single gene. Researchers have also identified more than 10 targets for additional genetic development, and others are being developed for higher value products. Hydrolysate fermentation trials are currently underway, and the process is being evaluated for commercial trials. The Fuel Ethanol Workshop took place at the Gaylord Opryland Resort & Convention Center in Nashville. Dr. Jeffries presented on June 18, 2008 at 8:30 a.m. (Central) About the Fuel Ethanol Workshop & Expo The fuel ethanol workshop program agenda is developed by a steering committee of ethanol producers. The committee�s objective is to help meet the needs and interests of the growing ethanol industry by focusing on issues and topics that improve production and plant operations. For additional information please visit https://www.fuelethanolworkshop.com. About Xethanol Corporation Xethanol Corporation is a diversified renewable energy company focused on alternate energy products and technologies as well as producing ethanol and other co-products. Xethanol may invest in renewable energy and clean technology, including biomass gasification for electricity production, wind power, solar power, energy storage, energy infrastructure, energy efficiency, waste recycling and agricultural processes. Xethanol has research agreements in place, including several aimed at efficient production of cellulosic ethanol. In addition to its work with the USDA Forest Products Lab in Madison, Wisconsin, Xethanol is working with other leading scientific institutions in the country, including the National Renewable Energy Lab in Golden, Colorado; Virginia Tech in Blacksburg, Virginia; and the Energy and Environmental Research Lab in Grand Forks, North Dakota. For more information about Xethanol, please visit its website at http://www.xethanol.com. Forward Looking Statements Some of the statements made in this press release may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on management�s current expectations and include known and unknown risks, uncertainties and other factors, many of which the company is unable to predict or control, that may cause the company�s actual results or performance to differ materially from any future results or performance expressed or implied by such forward-looking statements. These statements involve risks and uncertainties, including risks and uncertainties associated with whether the research the company is sponsoring will lead to commercial success. These risks and uncertainties are in addition to other factors detailed from time to time in the company�s filings with the SEC, including the section entitled �Risk Factors� in its annual report on Form 10-K for the year ended December 31, 2007. The company cautions investors that any forward-looking statements made by the company are not necessarily indicative of future performance. The company is not responsible for updating the information contained in this press release beyond the published date, or for changes made to this document by wire services or Internet services.