ERHC Energy, Inc., an independent oil and gas company, engages in the exploration, exploitation, and production of oil and gas reserves in the Gulf of Guinea offshore of central west Africa. It has rights to working interests in exploration acreage in the Joint Development Zone between the Democratic Republic of Sao Tome and Principe, and the Federal Republic of Nigeria, as well as in the territorial waters of Sao Tome. The company was formerly known as Environmental Remediation Holding Corporation and changed its name to ERHC Energy, Inc. in 2005. ERHC was founded in 1986 and is headquartered in Houston, Texas.