In 2009 and 2010 Hitachi Energy performed the “CREZ Reactive Power Compensation Study” for the Electric Reliability Council of Texas (ERCOT).

This was an extensive study involving many stakeholders including seven utilities and ERCOT. The primary purpose of the study was to evaluate the system performance of a new 345kV transmission network intended to bring renewable energy from West Texas and the Texas Panhandle to the eastern load centers in Dallas/Ft. Worth, Austin and San Antonio, and make recommendations related to planned series compensation and the needs for static and dynamic shunt compensation on the system.

In addition to the reactive power compensation, important evaluations of the subsynchronous resonance problems related to both thermal and wind turbine generators were performed. Since its completion the study has been relied on during much of the design and development of the CREZ transmission network.