The Mariposa Energy Project is a load-following, peaker power plant, which was designed to quickly start up and efficiently supply, from 25 megawatts to 200 megawatts of electricity, depending on the demand. It is sited inconspicuously on grazing land, between two low hills, amongst renewable wind and solar power sources in Alameda County, California. The facility’s output is dispatchable by PG&E, delivered to its electrical grid via the nearby 230-kV Kelso Substation. A new 580-foot pipeline interconnects with PG&E’s existing high-pressure natural gas pipeline.

Signet provided special inspection and materials testing services for this project encompassing soils compaction testing and observation, reinforced concrete, structural steel field welding, NDT for both shop fabrication and field erection of structural steel, fireproofing, proof load and torque testing.