Sharyland 150 MW Back-to-Back Asynchronous Tie

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The first open-access interconnection for commercial use between ERCOT and Mexico.

Sharyland Utilities has built a 150 MW back-to-back HVDC tie at Mission, Texas on the border with Mexico. Sharyland Utilities provides electrical service to the Sharyland Plantation Development.

Aerial overview of Sharyland back-to-back HVDC station. Click for larger picture.

Sharyland back-to-back HVDC station. Click for larger picture.

The tie enables power exchange with the Comisión Federal de Electricidad (CFE) in Mexico and also increases reliability of power in the Rio Grande Valley. As approved in mid-April 2005, it is the first large-scale open-access asynchronous interconnection suitable for commercial purposes between the ERCOT system in the United States and CFE. The 36 MW Eagle Pass / Piedras Negras HVDC Light link can also allow power exchange between ERCOT and CFE.

The interconnection was inaugurated in October 2007.

Main data
Commissioning year:	2007
Power rating:	150 MW
No. of poles:	1
AC voltage:	138 kV (both sides)
DC voltage:	±21 kV
Type of link	Back-to-back station
Main reason for choosing HVDC:	Asynchronous networks