SMUD Station G Substation

Built in 1892 as part of the first electrical service to a major city on theUnited States West Coast, Station A Substation in Sacramento, California,was nearing the end of its operational life. To ensure reliable electrical service to the downtown area, the Sacramento Municipal Utility District(SMUD) decided to replace Station A Substation with a new Station GSubstation in an adjacent location at 7th and G streets. The existing site was too small for current safety regulations given the necessary equipment and clearances.

Jensen Precast was selected to engineer, manufacture, and deliver two electric utility vaults with traffic loading in accordance with ASTM C857and ACI 318 and reinforcing steel in compliance with ASTM A615 Grade 60and ASTM A706 Grade 60. The exterior surfaces of the vaults were waterproofed with Xypex concentrate. Because Jensen Precast products are a standard for SMUD, the project was streamlined and cost efficient.


Sacramento Municipal Utility District


McGrath Electric Inc.


Mid-Valley Engineering


Jensen Precast Electric Utility Vaults 10’W x 30’L x 8’H
Jensen Precast Traffic Rated Pull Boxes and Covers


To ensure residents and businesses in the Downtown Sacramento area continued to receive reliable electrical service, SMUD needed to retire its antiquated Station A Substation and build a new structure to house a configuration with more output in a very limited amount of space. Along with a new control building, the project required the installation of two large underground vaults to house modern electrical equipment easily accessible by SMUD personnel for routine maintenance and periodic upgrades and repairs.


“We collaborated with Mid-Valley Engineering and McGrath Electric to build two 10’W x 30’L x 8’H electrical vaults reinforced for security and durability,” says Spencer Jones, Plant Manager of Jensen PrecastLockeford, California. “We built them in Lockeford in three levels for ease of transport and installation in a small setting. Each riser weighed just under 80,000 pounds and took nearly a week to construct. Tight timelines led to a concentrated effort from procurement, scheduling, and production to meet and exceed the customer’s requested ship dates. Our engineers were on site for consultation with SMUD during the two-day installation. Jensen Precast is a standard for SMUD, so we have experience understanding the types of structures needed to meet their specific requirements.”


  • Residents and businesses in Downtown Sacramento gain a new substation to power their vital electrical needs for the future.
  • SMUD solved a major challenge to its electrical services for California’s capital city for the long term.
  • Precast concrete enabled SMUD to provide a secure and reliable solution using a manufacturer with a solid track record with custom and standard products.
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