Siemens Expands Pomona Plant, Increases Capacity 116%
The 155,000-square-foot expansion gives operators in the region more access to critical electrical distribution equipment.
Updated on Oct. 26, 2026 in Manufacturing
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Siemens has completed a 155,000-square-foot expansion of its electrical distribution equipment plant in Pomona. The project significantly scales regional production capabilities for manufacturers reliant on local supply chains.
Why it matters
Operators face tightening demand for electrical components, making facility expansions like this critical for mitigating long-term supply constraints. The project demonstrates how manufacturers can integrate LEED Gold standards while scaling output within an active production environment.
The 155,000-square-foot expansion cost $65.5 million and boosted total production capacity by 116%. This project, which included the construction of 100,000 square feet of greenfield space, was completed over a 24-month duration.
The players
Siemens
A multinational conglomerate specializing in industrial automation, infrastructure, and electrical distribution equipment manufacturing.
The details
To execute the build without interrupting existing output, the construction team utilized a design-assist model to identify utility clashes and secure long-lead equipment early. Operations were protected through real-time vibration and particulate monitoring, while the floor plan was upgraded to include clear-span structural bays to support the increased equipment load.
Timeline
Construction of the Siemens plant expansion spanned a 24-month period.
Market Landscape
The project follows established industry sustainability benchmarks set by LEED Gold certification, reflecting a broader trend of incorporating energy-efficient design into heavy industrial manufacturing upgrades. This expansion mirrors competitive moves by major manufacturers to modernize infrastructure while adhering to increasingly stringent environmental standards.
Local operators sourcing electrical components should track whether this expanded capacity leads to improved lead times for regional orders. If you are managing your own facility upgrades, the project's use of design-assist partnerships serves as a blueprint for avoiding production downtime.
The takeaway
Large-scale facility expansions require rigorous, real-time site monitoring to maintain baseline production metrics during construction. Monitor this expansion as a case study for future regional hardware procurement negotiations.
Further reading
For broader trends in local industrial output, see the Manufacturing section.
Source note: This article includes information reported by Engineering News-Record (ENR) magazine.
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