- Antelope Valley Solar Ranch I
Our team provided engineering, procurement and construction (EPC) services for the substation, collection system and transmission line for the Antelope Valley Solar Ranch I project. This project consists of a 250-MW solar farm, a 230/34.5-kV substation, a 34.5-kV collection system, and five miles 230-kV overhead and underground transmission line interconnecting into Southern California Edison’s (SCE) Whirlwind Substation.
Approximately two miles of the 230-kV transmission line was installed underground, with the remainder installed overhead. Nine 34.5-kV collection system feeders were designed and installed in both underground and overhead spacer cable configurations.
In order to comply with SCE’s Large Generation Interconnection Agreement (LGIA), four 8.3 MVARs of mechanically switched capacitors banks and two-10 MVARs of shunt reactor banks were installed. Our work included:
- Los Angeles County permitting support. We were responsible for interfacing with Los Angeles County and First Solar’s third-party electrical reviewer and submitting construction packages in order to obtain building permit. Due to the nature and duration of the project, phased design review and phased construction were necessary.
- Substation and solar farm grounding analysis. Our team performed grounding analysis for both the substation and solar farm grounding.
- 230-kV transmission line. The team designed, specified and supported both the underground and overhead portions of the 230-kV single circuit transmission line.
- 34.5-kV/230-kV collection substation. We designed, specified and built a 230-kV substation with major equipment consisting of two 230-kV breakers, two 230-kV/34.5-kV, 133MVA step-up transformers, one 35-kV switchgear lineup, four 8.3-MVARs switched capacitor banks and two 10-MVARs shunt reactor banks.
The aggressive project schedule, dynamic changes during the permitting and design, and limited information available for a detailed design made this a challenging and exciting project.