TVA Emphasizes Grid Stability With Continued Use of Johnsonville Gas Units

Nov 12, 2025

Contact: Scott Brooks

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Release Summary

Due to increasing power demand, TVA will continue to operate 10 existing combustion turbine natural gas units at Johnsonville for the foreseeable future.
These units were set to be retired, but will remain online to support peak demand periods.
More information on the Final Environmental Assessment is available at tva.com/nepa.

KNOXVILLE, Tenn. – Due to increasing electricity demand, the Tennessee Valley Authority has made the decision to continue to operate the existing combustion turbine natural gas units at our Johnsonville site in Humphreys County, Tennessee, until further notice.

Details of the decision and consideration of potential environmental impacts are posted in the Final Environmental Assessment at tva.com/nepa.

TVA prepared the EA and requested public comments as we consider all options for meeting increased power demand in our region. The 10 CT units were previously planned for retirement.

The units were built in 1974 and are designed to run during periods of peak energy demand to ensure grid reliability and a stable power supply. TVA will continue to run them in the same fashion. Together, the units can supply up to 650 megawatts of energy during those peak periods, enough to supply approximately 400,000 homes. TVA will continue the decommissioning of six other CT units at the Johnsonville site as planned.

Johnsonville is also home to 10 state-of-the-art aeroderivative gas turbines, which provide additional resiliency and flexibility to the system during peak demand with a capacity of about 530 megawatts, enough to power approximately 300,000 homes.

TVA currently has more than 6,200 megawatts of additional generation either under construction or in consideration, including natural gas, solar, and energy storage.

About TVA

The Tennessee Valley Authority is the nation’s largest public power supplier, delivering energy to more than 10 million people across seven southeastern states. TVA has one of the most diverse energy systems – including nuclear, hydro, coal, gas, solar and advanced technologies. TVA is making significant investments in its power system toward new generation and transmission. 

TVA is a corporate agency of the United States, receiving no taxpayer funding, deriving virtually all of its revenues from sales of electricity. TVA maintains some of the lowest energy costs and highest reliability in the nation. TVA’s residential rates are lower than those paid by 80% of customers of the top 100 U.S. utilities, and its industrial rates are lower than those paid by over 90% of customers of the top 100 U.S. utilities. In addition, TVA provides flood control, navigation, and land management for the Tennessee River system, and assists local power companies and state and local governments with economic development and job creation. Learn more at tva.com.

Contact

Scott Brooks
Public Relations
[email protected]
865-632-7453

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