California ISO Iron Point Facility

A Mission Critical Headquarters Facility
The [CAL ISO] project completed nearly three months ahead of schedule and under budget. Those results are impressive by themselves but, of equal importance was the working relationship Clark maintained with us, project leadership, and the subcontractors.
Steve Berberich, Vice President & Chief Operating Officer, California ISO
Folsom, California
California ISO
Dreyfuss & Blackford Architects
278,000 Square Feet
Year Completed: 
LEED Platinum

The California Independent System Operator (California ISO) Iron Point Facility in Folsom is the 278,000 square-foot permanent headquarters for California ISO, a non-profit organization that controls the state's wholesale transmission grid. Throughout the project, Clark led the design-build efforts on the new headquarters, successfully delivering the project ahead of schedule and achieving the client's objectives for sustainability.

​​California ISO’s new headquarters is comprised of three wings, each serving a distinct function and each created with a different structural system. The building’s two-story public wing houses a main lobby and reception area, training rooms, a board room, a cafeteria, and support facilities. The mission critical wing supports California ISO’s essential services, including a grid operations center, 40,000 square-foot data center, and an ultra-high-reliability electrical and HVAC plant to ensure continuous operations. The three-story office wing accommodates the organization’s more than 500 employees and up to 250 additional contract workers. The open-office environment promotes collaboration and interaction, and the flexible design of the office space can accommodate future changes in personnel, teaming arrangements, and technologies.

Clark proposed a 24-month schedule, from groundbreaking to completion, to the client. The project team relied on the design-build principles of early integration and collaboration to maintain this fast-paced schedule. Through phased permitting and an innovative integrated steel design and delivery process, the California ISO Iron Point Facility was completed nearly three months ahead of schedule.

Despite the speed of the project, Clark maintained an emphasis on safety. Project team members worked more than 425,000 hours on the job with zero lost-time incidents.


As a prominent entity in the electrical power industry, California ISO plays a leadership role in promoting energy conservation, peak demand reduction, and emerging renewable energy sources. The project was originally designed to earn LEED Gold certification. Twelve months into the project, the cliennt challenged the team to reach Platinum certification. Clark, working closely with the project's designers and engineers, met this challenge

Sustainable elements at the facility include exterior sunshades and a thermal energy storage tank. Solar panels on the roof and in the parking lot account for nearly 20 percent of the building’s power. Efficient fixtures and systems save 30 percent of water and nearly 40 percent of energy compared to a baseline model.

The project also met the requirements of all five Water Efficiency LEED credits as well as an exemplary performance credit for water use reduction. A reclaimed water system recovers the water used during the cooling tower blowdown and allows the water to be stored, filtered, and then used by the buildings, water closets, and urinals. Reclaimed water not used by the toilet fixtures is diverted to a separate greywater system where it combines with water captured from the building drinking fountains, lavatories, and showers. This water is retained on site and is used in the landscape irrigation system, which uses zero potable water. The water efficiency result is 46.3 percent without water reuse, and 81.8 percent with reclaimed water reuse.


BIM played an integral role in the project’s successful completion. The team used BIM for coordination and interdisciplinary collaboration, expediting the prefabrication of materials, and in weekly look-ahead meetings between superintendents and foremen. The team took the BIM model to a further development and incorporated LEED metering and monitoring.

DBIA - Best Overall Design-Build Project
DBIA - Best Office Building
ENR - California Best Office Building Project