Calpine Corporation (Calpine) is an independent wholesale power producer in the United States. It owns and operates primarily natural gas-fired and geothermal power plants in North America and has presence in wholesale power markets in California, Texas and the Mid-Atlantic region of the United States. It has invested in clean power generation. It is developing, constructing and operating an environmentally responsible portfolio of power plants. Its portfolio is primarily consist of two types of power generation technologies: natural gas-fired combustion turbines, which are combined-cycle plants, and renewable geothermal conventional steam turbines. It sells wholesale power, steam, capacity, renewable energy credits and ancillary services to its customers. In November 2012, it completed the acquisition from Bosque Power Company, LLC, of a natural gas-fired, combined-cycle power plant. In December 2012, it sold the Broad River Energy Center to Broad River Power LLC.