Aera Energy LLC (or simply Aera) is a natural gas, oil exploration and production company started as a joint venture between Shell plc (through Shell USA) and Mobil (which later merged to form ExxonMobil). Headquartered in Bakersfield, California, Aera Energy LLC is a California limited liability company, and one of California’s largest oil and natural gas producers, with an approximate 2015 revenues of over $2 billion. Aera is operated as a stand-alone company through its board of managers.