Continued Operation of Johnsonville Combustion Turbine Units 1 Through 10

Humphreys County, Tennessee

On November 7, 2025, TVA issued the Final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) for the Continued Operation of Johnsonville Combustion Turbine (CT) Units 1 through 10 at the Johnsonville Reservation.

TVA prepared the EA, pursuant to the National Environmental Policy Act, to assess the effects of continuing to operate CT Units 1 through 10.  TVA realized a need to continue operating the units, which were previously identified for retirement and decommissioning, to respond to significant load growth in the Power Service Area.

The preferred alternative aligns with TVA’s 2019 IRP, which emphasizes the importance of maintaining a flexible, resilient, and diversified generation portfolio to support growing energy needs and the integration of renewable resources. Continuing operation of these CT units would allow TVA to leverage existing infrastructure, minimize environmental disturbance, and avoid the higher costs and longer lead times associated with constructing new generation facilities. These units would also preserve approximately 650 MW of dispatchable generation capacity, which is critical for maintaining system reliability during periods of peak demand.

The Draft EA was posted on TVA’s website for a 15-day public comment period on September 17, 2025, and comments were accepted via mail, e-mail, and online submission. To ensure broad public awareness, TVA published notices in newspapers serving the Humphreys County area, including The Camden Chronicle (Camden, TN) and The News Democrat (Waverly, TN).