Established in 1986, ERHC Energy is a publicly traded American company that owns a range of oil and gas assets in the Gulf of Guinea. The company has work interests in the Joint Development Zone (JDZ) of Nigeria and the Democratic Republic of Sao Tome and Principe. It also has partnerships with Addax Petroleum and Sinopec Corporation. ERHC Energy undertakes several deep water exploration and drilling operations, as well as focuses on the acquisition of various oil and gas reserves. The company s Exclusive Economic Zone is spread over an area of over 160,000 square kilometers.