Rentech, Inc. (stands for Renewable Energy Technology[2]) was a Los Angeles, California–based company that owned and operated wood fiber processing and nitrogen fertilizer manufacturing businesses.

[2] Rentech was initially formed in 1981 by Charles Benham and Mark Bohn to develop and commercialize synthetic fuel technologies.

[11][12] At the same year, it purchased the 55 MW biomass integrated gasification combined cycle power plant project in Port St. Joe, Florida.

[15] It closed its product demonstration unit in Commerce City which was developing technology for conversion of cellulosic biomass into synthetic gas.

[23] In 2012, Rentech acquired Agrifos LLC, which owns a synthetic granulated ammonium sulfate fertilizer plant in Pasadena, Texas.

[24] As of Feb. 21, 2017, Rentech posted on their website that the board has decided to idle the Wawa facility due to equipment and operational issues that would require additional unbudgeted capital investment, also stated is the uncertainty of profitability of wood pellets for heating.