TVA Sets Multiple All Time Power Demand Records During Historic September Heat Dome

Sep 24, 2026

Contact: Adam May

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Release Summary

TVA reliably delivered more than 30,000 megawatts of electricity on 17 days in September, surpassing a previous single-day record set in 2007.
TVA set 12 all-time power demand peaks for fall and spring months in September 2026, including a record 33,270-megawatt peak on September 3.
TVA’s sustained performance throughout the historic September heat dome shows the strength of the agency’s diverse energy mix.
Editor’s Note: Click here for audio, photos and b-roll.

KNOXVILLE, Tenn. – Unseasonably high temperatures across the Tennessee Valley drove demand for electricity to unprecedented levels in September 2026, leading the Tennessee Valley Authority to set multiple records for high power demand and system reliability.

As a powerful heat dome sent temperatures above 100 degrees across the region, homes, businesses and industries consumed significantly more energy to stay cool and operate. TVA reliably delivered more than 30,000 megawatts of electricity on 17 separate days in September. Prior to this, TVA experienced only one day in September above 30,000 megawatts - September 24, 2007. In addition, TVA set 12 all-time power demand peaks for any fall or spring month in September, including a record 33,270 megawatts delivered on September 3 – enough energy to power over 19.2 million homes.

“I’m proud of the work of TVA and local power provider employees to successfully meet demand through the summer and September’s historic heatwave, once again demonstrating their commitment to serving the Valley region,” said TVA interim president and CEO Mike Skaggs.

A diverse generation portfolio - nuclear, natural gas, hydro, coal and solar - enabled TVA to meet sustained high customer electricity demand throughout June, July and September, each of which set new monthly peak records:

June 30: 31,875 MW (all‑time June peak)
July 28: 32,732 MW (all‑time July peak)
September 3: 33,270 MW (highest demand day of 2026)

Other notable numbers:

August 17: 32,934 MW (summer Jun-Aug 2026 peak)
Labor Day: 28,431 MW (new Labor Day peak)

TVA reports that the region may need between 11 to 32 gigawatts of additional generation capacity through 2040. TVA is preparing for future demand with 4,120 megawatts of new generation now under construction and evaluating an additional 3,000 megawatts to strengthen long‑term reliability.

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, 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 and deriving virtually all of its revenue from electricity sales. TVA maintains some of the lowest energy costs and highest reliability in the nation. TVA’s residential rates are lower than those paid by almost 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

Adam May
TVA Media Relations
[email protected]
865-632-6000

TVA Media Line

Our media staff is available 24 hours a day. If you cannot reach the contact above, please call our media line at 865-632-6000.