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The Challenge

While working on SEPV-1 in Palmdale, CA, we began construction on our second large scale utility project located about 4 hours Southeast of Palmdale.  The design, scope, and access to local resources were about the same.  However, we needed to be efficient with our allocation of labor to meet the installation timelines and quality expectations.  Our scope also included the interconnection build-out including: underground, a power pole, switchgear, and a 38kV gang switch which was new for us.

Our Solution

We were able to time the completion of the mechanical installation at SEPV-1 so that once completed, we moved the mechanical team to this site while the electrical team started at the other site.  Both teams finished at roughly the same time, so that we could then execute the electrical scope at SEPV-2 within days of finishing work at SEPV-1.  The electrical work was sequential and organized: mounting combiner boxes, grounding solar modules and equipment, pulling home runs, mounting inverters & transformers, installing the switchgear and the power pole, pulling & terminating underground Medium Voltage cable, pulling and terminating all low voltage cable from combiner boxes, inverters, and secondary stages of the tranformers, completion of the communication & weather station equipment, and finally, connecting PV strings and energizing the entire site on both the DC and AC sides of the inverters.

Client Response

The experience Progressive Power Group gained on the first site paid off in meeting our goals on this site.  Their experienced crews handled the underground electrical infrastructure build-outs, concrete forms and pours, heavy equipment operation and electrical grounding.  All of these components are critical in larger scale electrical projects and solar farms.  Their knowledge of  codes and practices helped us to complete the job on time and at the best price.

Quick Facts

PPG Capabilities Utilized


Twentynine Palms, CA

Project Size


Project Duration

12 Weeks

Material Used

Polycrystalline, Single Axis Trackers, 25kV

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