The Smartstack energy storage platform from Fluence Energy is now commercially available for grid-scale applications. Deliveries of the AC-based system are scheduled to begin in in Q4 2025.
Smartstack’s patent-pending design strategically splits battery storage systems into units with easily transportable weight and dimensions, reducing shipping constraints and installation complexity. Onsite, the system maximizes project site density, delivering up to 7.5 MWh energy density when integrating 300-Ah generation batteries. This density is approximately 30% higher than currently available AC-based systems. The platform enables more megawatt-hour generation within existing project footprints, reducing costs and making previously constrained sites viable for storage project development.
Smartstack reimagines energy storage design through a flexible modular architecture that can be tailored for varying market needs. Two- and four-hour storage durations as well as longer six- and eight-hour durations are all available for sale now. The product’s proprietary form factor includes two key components:
- Smart Skid – A base platform that houses the brains of the Smartstack system. The Smart Skid integrates advanced cooling equipment, power control system hardware, all cabling, and comprehensive monitoring capabilities with convenient maintenance access.
- Pods – Smartstack battery pods sit atop the Smart Skid and contain the system’s battery cells. Pods support cells from multiple vendors, assuring the most competitive pricing and top performance. The pods are also designed to be swapped with replacement units during maintenance or technology upgrades to maximize system availability.
“Fluence’s track record of innovation and speed of execution drive us as we guide the energy storage industry forward. Backed by our industry-leading expertise developing and deploying innovative solutions globally, Smartstack reimagines how systems are designed, built, and maintained,” said Fluence President & CEO Julian Nebreda. “By addressing critical challenges like supply chain shipping constraints, product density, serviceability, and modularity, we are delivering a platform that is more scalable and easier to operate than competing solutions. This translates to superior project economics for our customers.”
Guaranteed to deliver up to 99% availability with Fluence’s long-term service agreement to help maximize revenue generation, Smartstack’s innovative approach makes intelligence, not hardware, the heart of innovation. The platform elevates system intelligence with locally deployed AI, autonomously optimizing embedded controls while providing full visibility across storage portfolios.
The modular design of Smartstack enables a more agile and cost-effective supply chain localization strategy, allowing components to be sourced or manufactured regionally to optimize availability, cost and compliance while enhancing resilience against geopolitical and logistical disruptions.
“Smartstack maintains Fluence’s uncompromising commitment to safety and cybersecurity, incorporating multi-layer protection systems,” said Mark Berger, Fluence VP of Product and Program Management. “The platform integrates the same industry-leading safety features as our trusted Gridstack products which includes large-scale fire testing certification, now at a much higher density. These advanced safety features work together to prevent, detect, and contain thermal events, minimizing potential damage and downtime. Our unwavering commitment to safety is at the heart of every product we deliver, and Smartstack is no exception.”
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