Mule Deer Switch Station Complete
June 30, 2025
June 30, 2025 – Central Texas — TNX Holdings is pleased to announce the successful completion of construction of the Mule Deer Switch Station, a key grid infrastructure asset that will enable the interconnection of the CIG DS1 Solar project (officially registered as Caliche Mound Solar, ERCOT #23INR0056) to the ERCOT transmission network.
While construction is now complete, station energization is expected in early 2026, in alignment with generation and system commissioning timelines.
Mule Deer Switch Station
Located in Deaf Smith County, the Mule Deer Switch Station is a 345 kilovolt (kV), three-ring bus switchyard engineered to provide high reliability, operational flexibility, and long-term scalability. The station will serve as the point of interconnection (POI) for CIG DS1 Solar, which has a 442 MVA interconnection and a net dispatch capacity of 406 MW at the generator terminals, supporting 512 MW(DC) of solar generation.
Power from the switchyard will be delivered to the grid via the Windmill 345 kV line segment, enabling efficient integration of renewable energy into ERCOT’s high-voltage system and supporting Texas’s broader decarbonization and reliability goals.
The station was developed and constructed in full compliance with ERCOT and NERC standards. Its three-breaker ring bus configuration ensures enhanced operational redundancy and system protection, while maintaining the flexibility to support future line extensions and additional generation interconnections.
The completion of civil and electrical construction at Mule Deer marks a major milestone in CIG's and TNX Holdings’ broader mission to develop critical grid infrastructure that supports the reliable delivery of utility-scale clean power across the ERCOT market.
For More Information About the DS1 Project:
See Project Information —>
About TNX Holdings:
TNX Holdings, Inc. (“TNX”) is a project development company focused on renewable energy infrastructure. TNX originates, develops, and invests in utility-scale projects, partnering with industry-leading operators to deliver world-class execution. The company supports both early-stage development and long-term asset ownership across the renewable energy spectrum.
While construction is now complete, station energization is expected in early 2026, in alignment with generation and system commissioning timelines.
Mule Deer Switch Station
Located in Deaf Smith County, the Mule Deer Switch Station is a 345 kilovolt (kV), three-ring bus switchyard engineered to provide high reliability, operational flexibility, and long-term scalability. The station will serve as the point of interconnection (POI) for CIG DS1 Solar, which has a 442 MVA interconnection and a net dispatch capacity of 406 MW at the generator terminals, supporting 512 MW(DC) of solar generation.
Power from the switchyard will be delivered to the grid via the Windmill 345 kV line segment, enabling efficient integration of renewable energy into ERCOT’s high-voltage system and supporting Texas’s broader decarbonization and reliability goals.
The station was developed and constructed in full compliance with ERCOT and NERC standards. Its three-breaker ring bus configuration ensures enhanced operational redundancy and system protection, while maintaining the flexibility to support future line extensions and additional generation interconnections.
The completion of civil and electrical construction at Mule Deer marks a major milestone in CIG's and TNX Holdings’ broader mission to develop critical grid infrastructure that supports the reliable delivery of utility-scale clean power across the ERCOT market.
For More Information About the DS1 Project:
See Project Information —>
About TNX Holdings:
TNX Holdings, Inc. (“TNX”) is a project development company focused on renewable energy infrastructure. TNX originates, develops, and invests in utility-scale projects, partnering with industry-leading operators to deliver world-class execution. The company supports both early-stage development and long-term asset ownership across the renewable energy spectrum.