Vistra is a Fortune 500 integrated retail electricity and power generation company based in Irving, Texas. The company is the largest competitive power generator in the U.S. with a capacity of approximately 39GW powered by a diverse portfolio, including natural gas, nuclear, solar, and battery energy storage facilities. In the 2020 Forbes Global 2000, Vistra Energy was ranked as the 756th-largest public company in the world. The company owns the Moss Landing Power Plant in California which currently contains the largest battery energy storage system in the world. As of 2020, the company was ranked as the highest CO₂ emitter in the US. Wikipedia