The Company expects that the expanded mandate for corn-based ethanol will continue the growth in demand for ammonia nitrogen fertilizer products produced by our wholly-owned subsidiary, Rentech Energy Midwest Corporation (“REMC”), in East Dubuque, Illinois. The Company also believes the new mandate for renewable biodiesel fuel will expedite the development of America’s biodiesel industry and will create additional opportunities for application of the Rentech Process to produce ultra-clean diesel fuel.

REMC has seen better than projected revenues as a result of the previous mandate of approximately 7.5 billion gallons per year of corn ethanol production. The new law doubles the size of the corn-ethanol mandate to 15 billion gallons per year by 2015. D. Hunt Ramsbottom, President and CEO of Rentech, stated, “We expect the increase in the corn ethanol blending requirement under the new energy bill to continue to drive strong fertilizer demand in the region served by REMC well into the future.”

The new energy bill also creates a new mandate for renewable diesel fuel. The Rentech Process is capable of using a wide array of domestic resources, including biomass and municipal solid waste, to produce ultra-clean diesel fuel. Rentech’s proposed plant in Adams County, Mississippi will be designed to utilize biomass as well as petroleum coke or coal to produce ultra-clean diesel fuel. In addition, Rentech has an agreement with the Solena Group to develop a municipal solid waste-to-fuels plant in Northern California which will be capable of diesel and jet fuel production. Mr. Ramsbottom added, “This new biodiesel mandate will drive commercialization of next-generation biofuels production and Rentech intends to be at the forefront of that effort.”

About Rentech, Inc.

Rentech, Inc. (www.rentechinc.com), incorporated in 1981, provides clean energy solutions. The Company has developed and patented the Rentech Process which transforms under-utilized domestic energy resources into valuable and clean alternative fuels and chemicals. These energy resources include coal, petroleum coke, biomass and municipal solid waste.

Safe Harbor

This press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995 about matters such as the prospects of the creation of additional sales opportunities for the Company’s fuels and continued strong demand for REMC’s products. These statements are based on management’s current expectations and actual results may differ materially as a result of various risks and uncertainties. Factors that could cause actual results to differ from those reflected in the forward-looking statements are set forth in the Company’s press releases and periodic public filings with the Securities and Exchange Commission, which are available via Rentech’s web site at www.rentechinc.com. The forward-looking statements in this press release are made as of December 20, 2007, and Rentech does not undertake to revise or update these forward-looking statements, except to the extent that it is required to do so under applicable law