John Sevier Combined Cycle Plant
Balancing efficient power production with environmental protection
John Sevier Combined Cycle Plant, adjacent to John Sevier Fossil Plant, is TVA's newest generating plant. It began commercial operation on April 30, 2012, a month ahead of schedule and about $30 million under budget. The 880-megawatt facility uses clean natural gas along with equipment that reduces emissions to a very low level. This supports TVA's vision to be a national leader in improving air quality.
How it works
The plant design allows for simple cycle combustion turbine operation with a summer capacity of 490 megawatts or combined cycle operation with a summer capacity of 880 megawatts.
The simple cycle stage uses three combustion turbines similar to jet engines. Air entering each unit is compressed, mixed with natural gas and ignited. The hot gas then expands through a gas turbine that turns a generator to produce electricity.
In combined cycle operation, residual heat from the gas turbine exhaust is captured to produce steam that generates additional electricity from a steam turbine.
The ability to run in either combined cycle or simple cycle mode provides voltage stability and reliability to the northeast region of the TVA system.
Other TVA combined cycle facilities
The plant is TVA's second combined cycle facility in Tennessee and the second new generation site constructed by TVA since 2002. It is the fifth combined cycle site for TVA. TVA’s other combined cycle plants are Caledonia, Magnolia and Southaven, all located in Mississippi; and Lagoon Creek near Brownsville, Tenn.