City Utilities of Springfield is modernizing its grid with a utility-scale battery energy storage system (BESS) engineered to strengthen grid reliability, accelerate renewable energy integration and deliver flexible power management across its service territory. The project addresses growing demand for advanced energy infrastructure capable of frequency regulation, peak shaving and emergency backup power.
Stanley Consultants is providing complete engineering design services for this transformative BESS project, which commenced in July 2025. Our electrical engineering design encompasses power conversion systems enabling bidirectional energy transfer, containerized battery storage with integrated thermal management and fire suppression, medium voltage switchgear and transformers, grid interconnection systems with protective relaying and SCADA interfaces. Civil and structural design includes drilled pier and slab-on-grade foundations, equipment support structures, site grading with stormwater management, access roads, perimeter security fencing and transformer oil containment.
Central to the project is the Eos Z3™ long-duration energy storage platform, selected for its inherently nonflammable aqueous zinc chemistry, 20-year operating life, American manufacturing and ability to provide utility-scale storage without the thermal runaway risks associated with conventional lithium-ion technologies. Spanning two sites at 36 MW / 216 MWh total capacity, the system's nonflammable chemistry reduces fire protection complexity while minimizing auxiliary power requirements and supporting simplified long-term operation. Selected to support a strong community interest in safer, more sustainable energy storage options, the behind-the-meter deployment supports peak shaving and load offsetting with minimal operational risk.
City Utilities of Springfield needed a safe, long-life, utility-scale storage platform capable of supporting evolving grid demands. Stanley Consultants served as engineer of record, providing design expertise for the project, while Eos Energy provided zinc-based battery technology that met the utility’s operational, safety and lifecycle requirements. Together, the project delivers a resilient, future-ready energy storage solution that supports renewable integration, voltage regulation and revenue-generating ancillary services while establishing a foundation for continued energy storage investment and long-term grid modernization.