TVA Adds 500 Megawatts to Region’s Power Grid

Jul 9, 2025

Contact: Scott Fiedler

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Release Summary

TVA adds 500 megawatts of energy to the region’s power grid – enough electricity to power almost 300,000 homes.
The 10 new aeroderivative gas turbines, at Johnsonville Combustion Turbine Plant, can go from a cold engine to full power in five minutes, generating 50 megawatts per unit.
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KNOXVILLE, Tenn. — Just in time for summer, the Tennessee Valley Authority is unleashing more American energy with the announcement Wednesday that it has added 500 additional megawatts of electricity to the power grid – enough energy to power almost 300,000 homes.

With the completion of the 10 new aeroderivative gas turbines at Johnsonville Combustion Turbine Plant, west of Nashville, the Johnsonville site can now provide more than 1,200 megawatts to TVA’s grid, which provides electricity to more than 10 million people across seven states.

Justin McBath, TVA senior project manager, noted that the new natural gas turbines are similar to the aerospace engines they evolved from. They are designed to ramp up and down quickly or be turned off when not needed.

“They have a fast-start option,” said McBath. “You can go from a cold engine to full power in five minutes, generating 50 megawatts per unit – and these will actually generate up to around 57 to 59 megawatts under the right conditions.”

These features make the new units highly flexible – ideal for meeting daily and seasonal peaks in electricity demand. Last month, these units were put to the test as the region experienced its first heatwave. The average system temperature on June 25, 2025 (96 degrees) was the same as June 25 a year ago — but TVA saw an approximate 500-megawatt increase in demand. The year-over-year power increase reflects population growth, economic expansion, and the integration of new electricity-dependent technologies.

“This project helps to support the continued growth and demand for electricity in the Valley by adding new generators on the system,” said Eric Grau, TVA vice president of Gas Operations. “And the added benefit of these generators in particular is to provide additional reliability.”

The Johnsonville aeroderivative turbines are the first of their kind for TVA, but they won’t be the last. Construction is already underway on 16 aeros at TVA’s 1,500-megawatt energy complex on the site of Kingston Fossil Plant in Roane County, Tennessee.

Moving forward, TVA plans to build about 6,200 megawatts of new generation. Over 3,500 of those megawatts are already under construction – enough to power about 2 million homes.

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 Fiedler
Public Relations
[email protected]
423-751-7883

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