100 MW Solar Project: Future-Ready Substation and Transmission Design

Client Challenge

A renewable energy developer required expanded grid infrastructure for a 100 MW solar facility, including a new collector substation and a 138 kV transmission line to connect the project to the utility system. While another firm designed the collection system, SGC Power was engaged to deliver the substation and transmission line, with capacity for future storage and reactive compensation.

How We Helped

SGC Power was selected through a competitive bid to provide the complete design package for the new 138/34.5 kV collector substation and the 0.25-mile 138 kV transmission line connecting to the utility substation. Our team produced 30% conceptual, 75% bid-ready, 100% start-of-construction, issued-for-construction, and final record drawings, as well as civil, electrical, and protection and control design. We also conducted supporting studies, including short-circuit analysis, neutral-ground reactor sizing, equipment specifications, FERC Form 8 documentation, and construction support.

The substation accommodates three 34.5 kV feeder circuits from the collection system through a 69/92/115 MVA transformer, with provisions for future expansion. The high-voltage side includes additional motor-operated disconnect switches to support planned storage projects, while the low-voltage side allows space for a future capacitor bank. A dedicated control shelter contains the AC/DC systems and protection and control equipment.

Powerful Results

SGC Power completed the project on time and under budget. The client has since engaged SGC Power for additional renewable energy projects, demonstrating the strength of the partnership and the quality of our work.

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