Step-up transformers installed at Vogtle nuclear expansion

Over the past week, workers placed the four main step-up transformers at the Vogtle nuclear expansion near Waynesboro, Georgia.

Each transformer weigh about 420,000 pounds and are now in place inside the Unit 4 transformer bays located near the unit’s turbine building, according to Georgia Power.

The transformers will increase the voltage produced by the turbine generators from 26,000 volts to 500,000 volts before the energy flows to the state’s power grid to serve hundreds of thousands of customers.

Teams also completed a concrete placement inside the Unit 4 containment vessel, clearing the path for installation of the first floor module for the unit, CA32.

Other recent milestones at the site include the placement of the second floor module for the Unit 3 operating deck, CA56. This module is part of the steel floor that sits above the In-Containment Refueling Water Storage Tank. The IRWST is a 75,300-cubic-foot tank that, once the units are operational, is filled with borated water and is a key safety feature within containment providing automatic, gravity-fed backup cooling for the reactor vessel.

With more than 6,000 construction workers onsite today, the Vogtle nuclear expansion is the largest job-producing project in the state of Georgia. The thousands of workers onsite every day continue to focus on safety and productivity with the target in-service dates for the units remaining November 2021 (Unit 3) and November 2022 (Unit 4), according to the 18th Vogtle Construction Monitoring (VCM) Report.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at

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