page_title: Philo Power Plant
section_title: Philo Unit 6
hierarchical_section_title: Philo Power Plant / Philo Unit 6
caption_attribution_description: English: Two sculptures created by George Greenamyer stand in the courtyard outside of AEP Headquarters in Columbus, Ohio. In the foreground is Philo Unit 6's turbine and to the right is Twin Branch Unit 4's turbine.
context_page_description: Philo Power Plant was a 510 megawatt, coal power plant located in Philo in Muskingum County, Ohio. It was the first power plant in the United States to apply steam reheat and supercritical steam generator technologies for its turbines. The plant had six units and its operations were handled by Ohio Power, a forerunner of American Electric Power. It operated from 1924 until ceasing in 1975.
context_section_description: Philo Unit 6 was the nation's first commercial supercritical steam generator. The unit began commercial generation in 1957 with nameplate capacity of 120 MW. Its steam generator, designed and built by Babcock & Wilcox, had a maximum pressure of 4,500 psi (31,000 kPa) and an operating temperature of about 1,150 °F (621 °C). Its steam turbine was designed and built by General Electric that made 3,600 rpm. The unit was able to demonstrate operations at ultrasupercritical levels, but due to the lack of metals able to tolerate the extreme temperatures, the levels were unsustainable. To support the new unit, a 183 ft (56 m) smokestack was erected. The total cost to construct Philo Unit 6 was approximately $19.5 million.
caption: Philo Unit 6's turbine in the foreground at the AEP Building in Columbus, Ohio
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