Tenaska Power Services Co. (TPS) is a wholly owned subsidiary of Tenaska, a privately held energy company headquartered in Omaha, Nebraska, with offices in Dallas, Denver, Philadelphia, Houston, Boston, and Calgary and Vancouver, Canada. Tenaska was founded in 1987 and is consistently ranked by Forbes magazine among the largest privately held companies in the United States.TPS, established in 1997, is a conservative marketing company focusing on energy management and the optimization of energy, both physically and financially. TPS is a leading energy manager in the U.S., providing a robust range of services to generation and demand-side customers across AESO, CAISO, ERCOT, IESO, ISO-NE, MISO, NYISO, PJM, SERC, SPP and WECC. TPS is also a leading provider of services to the renewables industry.