Talen Energy Corporation owns and operates power infrastructure in the United States. The Company produces and sells electricity, capacity, and ancillary services in wholesale power markets in the United States, primarily in PJM and WECC, with its generation fleet principally located in the Mid-Atlantic region of the United States and Montana. The majority of its generation is produced at its zero-carbon nuclear and lower-carbon gas-fired facilities. Its generation capacity is 10,665 megawatts (MW). Its segments include PJM and Other. The PJM segment is engaged in electricity generation, marketing activities, commodity risk and fuel management within the PJM RTO or ISO markets and comprises Susquehanna and Talen’s natural gas and coal generation facilities. Its Other segment includes the operating and marketing activities of Talen Montana’s proportionate share of the Colstrip Units in the WECC market, the operating activities of Nautilus, and other development activities.