Calpine Corporation is a power generation company. The Company is engaged in the ownership and operation of primarily natural gas-fired and geothermal power plants in North America. The Company's segments include West (including geothermal), Texas and East (including Canada). In the Northeast and Mid-Atlantic regions, the Company has generating units capable of burning either natural gas or fuel oil. As of December 31, 2016, the Company's portfolio consisted of two types of power generation technologies, including natural gas-fired combustion turbines, such as combined-cycle plants, and renewable geothermal conventional steam turbines. As of December 31, 2016, the Company's portfolio included 80 power plants, including one under construction, with an aggregate generation capacity of 25,908 Megawatt (MW) and 828 MW under construction. As of December 31, 2016, it had four MW of capacity from solar power generation technology at its Vineland Solar Energy Center in New Jersey.