High Quality Content by WIKIPEDIA articles! Aera Energy LLC (Aera) is a natural gas, oil exploration and production company jointly owned by Shell and ExxonMobil headquartered in Bakersfield, California. In addition, Aera Energy LLC is a California limited liability company, and one of California’s largest oil and natural gas producers, with an approximate 2011 revenues of over $5.6 billion. Aera is operated as a stand-alone company through its board of directors.