Headquartered in San Francisco, California, Pattern Energy Group is a major independent power company and renewable energy developer with one of the largest renewable energy portfolios in North America. Founded in 2009, the company owns and operates wind, solar, and transmission assets across the US, Canada, and Japan, with over 6 GW of generating capacity. In 2020, Pattern Energy was acquired by Canada Pension Plan Investment Board (CPP Investments) and Riverstone Holdings. The company continues to develop and operate renewable energy projects serving utilities, corporations, and public power authorities across multiple US states.