Topical Updates – Operational Considerations: Community and Environmental Impact
How would plant and transmission build and operation impact my community and environment?
TVA is planning to prepare an Environmental Impact Statement (EIS) to address the potential impacts associated with the generation site. Some of the areas that will be reviewed in the EIS include recreation, prime farmland, biological resources and species, emergency response, visual resources, noise, public and occupational health and safety, and environmental justice. TVA expects to release the Draft EIS no earlier than late-2024 and then consider comments received on the Draft EIS before issuing the Final EIS. TVA projects completing a Final EIS in mid-2025 before making a final determination on proceeding with the preferred alternative. The below summarizes the components and requirements of the proposed generation site along with potentially needed transmission upgrades. The scoping report contains additional information, available at www.tva.com/environment/environmental-stewardship/environmental- reviews/nepa-detail/cheatham-county-generation-site. The proposed plant’s major equipment systems would include 10 dual-fuel aeroderivative CT generators, four gas-fired frame CT generators, and three dew-point gas heaters. Other plant equipment and systems would include a natural gas compressor station; natural gas metering and handling systems; instrumentation and controls systems; transformers; and administration, warehouse, and maintenance buildings. Additional technical components would include aqueous ammonia systems, fuel oil storage tanks, and emergency firewater pumps. The plant would require up to about 100 gallons per minute of potable water, which would be provided by Pleasant View Utility District. The plant would not require any uptake water from Sycamore Creek or discharge into Sycamore Creek. The plant would require construction of a new approximately 8-mile natural gas pipeline lateral up to 30 inches in diameter, along with infrastructure to connect the plant to the new pipeline. Preliminary estimates indicate that the plant would require approximately 221,000,000 standard cubic feet per day (SCFD) of natural gas, delivered to the site at a minimum of 610 pounds per square inch.
The plant would also require on-site storage of ultra-low-sulfur diesel (ULSD), a petroleum fuel, as an emergency backup fuel for the aero CTs.
The plant would also need an on-site 161-kV switchyard, switch house, unit substation transformers, and various electrical components. To connect the plant to the existing transmission system, TVA would construct two to four double-circuit transmission lines, totaling approximately 35 to 45 miles. Upgrades would potentially need to be performed to accommodate the increased electrical load of the existing transmission lines, including moving sheds or storages located within the right-of- way, replacing or modifying structures or conductor, adding rock or dirt to structure footing, lowering or re-rerouting Local Power Company distribution lines that intersect TVA transmission lines, installing fiber optic ground wire, and developing new permanent access roads to support upgrades.
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