Cumberland Charges Ahead with Back‑to‑Back Milestones

Unit 2 First Fire and Combustion Turbine 1 Grid Synchronization

The Cumberland Combined Cycle Project marked a major step forward last week as TVA successfully synchronized Combustion Turbine 1 (CT1) to the transmission grid and achieved first fire on Unit 2 – two milestones that position the site firmly on track for commercial operation later this year.

After receiving permanent gas supply from the Tennessee Gas Pipeline on May 26, the team successfully synchronized CT1 to TVA’s transmission grid on May 29 – a crucial step that connects the turbine to the power system so electricity can eventually be delivered to customers once the unit begins generating power. Syncing also confirms the generator is operating in alignment with system voltage and frequency.

Just two days later, on May 31, Unit 2 achieved first fire, safely igniting fuel and beginning its startup testing sequence.

These consecutive achievements highlight the project’s strong momentum as both combined‑cycle units move toward testing and operational readiness.

Building on Recent Success

These steps build on the earlier success of Unit 1’s first fire, completed on April 28. For that test, the team used compressed natural gas delivered by truck so the project could stay on schedule while permanent pipeline work was still being finished. The unit reached full speed under its own power, proving that important systems like fuel delivery and controls were working correctly. The permanent gas supply arrived later in May, helping the project move into the next phase.

TVA expects the plant to be ready for commercial operation later this year. When both units are fully online, the new combined cycle plant will add about 1,450 megawatts of efficient, reliable energy to TVA’s system.

“As we reach these latest milestones at Cumberland, our teams continue to demonstrate exceptional expertise and commitment” said Sam Vinson, general manager of Major Projects. “Every step forward brings us closer to additional capacity that will strengthen reliability across the Valley and support TVA’s long‑term energy strategy.”