Stanford University’s Stanford Energy System Innovations (SESI) project transformed the campus energy system from a traditional cogeneration plant to a more sustainable low-temperature hot water (LTHW) system. As part of this major infrastructure modernization effort, Preston Pipelines partnered with Whiting-Turner to support expansion of the Central Energy Facility (CEF) and construct new condenser and chilled water infrastructure throughout the Stanford campus in Stanford, California.

The project included installation of more than 22 miles of insulated steel hot water piping ranging from 4 to 24 inches in diameter, approximately 27,900 linear feet of chilled water piping, and 14,000 linear feet of electrical duct banks. Preston also performed extensive potholing, utility coordination, and preconstruction support to help navigate the highly congested underground environment across the active campus.

Construction activities were completed while Stanford University remained fully operational, requiring careful phasing, coordination, and real-time problem-solving within active roadways, pedestrian corridors, hospital access routes, and utility corridors. Through close collaboration and technical expertise, Preston Pipelines successfully delivered critical underground infrastructure supporting one of the most advanced and sustainable campus energy systems in California.