Gerdau Orders One-of-a-kind Power Solution from Primetals Technologies

Primetals Technologies has won a contract to provide the Gerdau Petersburg plant in Virginia, U.S.A., with a 69-kV static synchronous compensator (STATCOM) to support the plant’s alternating current electric arc furnace (AC EAF) operation. Once commissioned, it will be the largest industrial STATCOM ever implemented at a steelmaking plant in North America.

Stabilizing the Grid

Large and varying electrical loads from electric arc furnaces (EAF) may disturb the electrical supply system in steelmaking. The disturbance is caused by fluctuations in reactive power and/or unsymmetrical loads. A STATCOM mitigates flicker by providing or absorbing reactive current at the connection point between the mill’s electrical distribution infrastructure and the utility power system. The 69-kV STATCOM with an insulated-gate bipolar transistor (IGBT) module provides a dynamic and fast response, which cannot be achieved by a conventional static voltage compensator (SVC) system with thyristor-controlled reactors.

Primetals Technologies will supply an industry-first, 69-kV static synchronous compensator (STATCOM) for the Gerdau mill in Petersburg, Virginia, USA. Pictured here is a 34.5kV STATCOM that Primetals Technologies recently supplied to Gerdau in Cartersville, Georgia, U.S.A.

Complex and One-of-a-kind

In 2022, Primetals Technologies worked with a team at the Gerdau Petersburg plant to develop the conceptual design for the 69-kV STATCOM and model AC EAF operation under present and future conditions. Gerdau Petersburg has accepted the project’s conceptual design, and groundbreaking is imminent. All work will be completed within the next 27 months. This order demonstrates Gerdau’s confidence in the Primetals Technologies team. Implementing such complex technology requires deep knowledge of AC EAFs and grid-level electrical power systems—expertise differentiating Primetals Technologies from most electrical power designers.


Most STATCOMs used in steelmaking operations have a direct-connection voltage of only 13.8 kV or 34 kV. This STATCOM provides 69 kV, which the Gerdau Petersburg plant will use to:

  • Ensure continuity of operation for the current plant and its 69-kV primary AC EAF transformer
  • Double dynamic reactive power support
  • Sustain AC EAF production volume without any impact on the power grid of the electrical utility


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