Siemens Completes Major Pomona Plant Expansion

The 155,000-square-foot facility project increases production capacity by 116%.

Updated on Oct. 26, 2026 in Manufacturing

Isometric editorial illustration of clean, modular industrial steel framework and concrete pillars, representing structural expansion and manufacturing growth. — Siemens has finalized a $65.5 million expansion of its Pomona electrical distribution plant, increasing total production capacity by 116 percent. AI Illustration. Upload story photo >

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Siemens has finalized a $65.5 million expansion of its electrical distribution equipment plant in Pomona. The project adds significant scale while boosting the site's total production capacity by 116%.

Why it matters

This expansion bolsters the local industrial landscape by drastically increasing manufacturing output for vital electrical infrastructure. The facility also incorporates sustainable design, having achieved LEED Gold certification.

The expansion project totaled $65.5 million and spanned 155,000 square feet. This investment increased the facility's overall production capacity by 116% compared to its previous output levels.

The players

Siemens

A multinational technology conglomerate that specializes in industrial manufacturing, infrastructure, and electrical distribution equipment.

The details

Construction teams utilized clear-span structural bays and reinforced floor systems while performing real-time vibration and particulate monitoring to keep existing production lines active. Trade partners employed a design-assist arrangement to resolve construction clashes and secure long-lead equipment ahead of schedule.

The construction program lasted for a 24-month period.

Market Landscape

The project aligns with the industry-wide focus on achieving LEED Gold certification to enhance operational sustainability and energy efficiency. This modernization positions the plant as a top-tier manufacturing hub, reflecting a shift toward high-tech, efficient domestic industrial infrastructure.

The project integrates a 5,000-square-foot community art space that will be accessible to local residents. While the expansion primarily impacts industrial output, the site's new public-facing amenities provide a tangible benefit to the neighborhood's cultural infrastructure.

The takeaway

Large-scale industrial projects that integrate community spaces can successfully balance manufacturing growth with local urban needs. Residents and stakeholders may note that design-assist project management often leads to efficiency gains in complex construction environments.