Red Horse Substation and Transmission Line

Cochise County, AZ, USA

Renewable Energy, Substation & Switchyard

Project Highlights

  • EPC buildout of 345 kV substation and 34.5 kV transmission lines.
  • Designed for a combined solar/wind project.
  • Designed/built hook stick switch additions in additional project phase.

ECI/EPCS provided full engineering, procurement, construction and testing for the Red Horse Wind and Solar Project. The project interconnects with Tucson Electric Power (TEP) at the Winchester 345 kV Substation. The Red Horse project includes a 55 MW PV solar generation plant and a 30 MW wind project that will utilize fifteen (15) Vestas V110, 2 MW turbines. The 34.5 kV collection circuits consist of a double circuit 34.5 kV line, 2.83 miles in length, from which two sections of single circuit line are extended to solar and wind project sites; a single circuit 34.5 kV line, 2.76 miles in length extending to the solar generation site from the end of the double circuit; single circuit 34.5 kV line, 5.46 miles in length extending to the wind generation site from the end of the double circuit and a pad mounted, 34.5 kV switchgear having three (3) positions of interrupters for protection of solar field feeders, as well as a fourth position for service to solar field station auxiliary equipment.

The project substation has one (1) 345-34.5 kV substation bay, two (2) 34.5 kV feeder positions serving the overhead double circuit line, as well as one (1) 34.5 kV position with a power circuit breaker and CapSwitcher serving a 20 MVAR capacitor bank. The incoming line would be protected by a single 345 kV PCB having a line side 345 kV group-operated motorized air disconnect switch.

The substation was designed with two-bundle 954 kCM AAC conductor jumpers on the 345 kV side, as well as 3″ and 2″ SPS aluminum rigid bus on the 34.5 kV side. The 345 kV deadend structure will be a tapered tubular design; all other steel will utilize standard shapes. The substation included all work from concept through test and commissioning prior to energization. Phase I of this project energized in mid-2015.

The second phase, Red Horse Solar Substation II included full engineering design, procurement, construction and testing for the installation of (6) additional hook stick switches for the new incoming UG feeder circuit for the Red Horse 2 Substation Expansion. Phase II of this project energized in early 2016.

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