ANDRITZ expands flue gas treatment capacity at TVA’s Shawnee Fossil Plant

Upgraded emission-control technology for a long-serving power plant
The Tennessee Valley Authority has selected ANDRITZ to install two additional flue gas treatment systems at the Shawnee Fossil Plant in Paducah, Kentucky. The project expands the site’s emission-control infrastructure and strengthens its ability to meet current U.S. environmental regulations, including requirements under the EPA’s Regional Haze Rule.

This new contract builds on previous installations at Shawnee, where ANDRITZ supplied spray dry absorber units commissioned in 2017. The upcoming systems introduce updated absorber technology designed to improve capture performance for regulated acid gases.

New spray dry absorbers for Units 8 and 9
The scope of supply includes two spray dry absorbers (SDAs) engineered for Boiler Units 8 and 9. Each absorber is designed to remove sulfur oxides (SO₂/SO₃) and hydrogen chloride (HCl) by injecting a finely atomized alkaline slurry into the flue gas stream. The neutralized particulate byproducts are then captured in existing downstream bag filters.

Compared with the systems installed in 2017, the new SDA equipment reflects ANDRITZ’s current design practices, which focus on atomization efficiency, consistent reagent utilization, and improved integration with particulate filtration systems.

Integration with existing emission-control assets
By adding SDAs to additional boiler units, TVA creates a more uniform flue gas treatment capability across the facility. The combined operation of all four absorbers improves the plant’s overall emission performance while simplifying compliance management.

The Shawnee Fossil Plant has provided power to the region for more than seven decades. Upgrading emissions equipment allows TVA to keep the units available during a period of growing electricity demand in the Tennessee Valley.

Industry context and project value
Spray dry absorbers are widely deployed in fossil-fuel plants that require acid-gas reduction with moderate water consumption and flexible load compatibility. Comparable systems are used in U.S. facilities operated by utilities such as Duke Energy and Xcel Energy, which also rely on SDA-plus-bag-filter configurations for sulfur oxide control.

The order value for the Shawnee project is described as being in the mid double-digit million-euro range, and is included in ANDRITZ’s Q3 2025 order intake.

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