Fluence Energy, Inc. has introduced the Smartstack 10 MWh system, the latest expansion of its Smartstack platform, to address the growing demand for high-density energy storage. The new system joins the existing 7.5 MWh option, offering expanded capacity while maintaining the electrical architecture and deployment model of the platform. This development is significant for independent power producers, utilities, and data center developers aiming to maximize capacity on limited land.

The Smartstack 10 MWh system achieves a core site-level energy density of approximately 680 MWh/acre (168 kWh/m²). Through an evolved pod design, the system increases capacity without expanding its physical footprint, positioning it among the most density-competitive grid-scale storage solutions available. The platform helps customers maximize site ROI by improving land use and reducing balance-of-plant costs by up to 40% versus standard DC blocks.

Safety remains a foundational element of the Smartstack architecture. The 10 MWh system has successfully completed Large-Scale Fire Testing (LSFT). Its compartmentalized design limits thermal exposure, reinforcing containment and risk mitigation across the platform.

Peter Williams, SVP and Chief Product and Supply Chain Officer at Fluence, emphasized the platform's adaptability. "Smartstack was built as a platform, and the 10 MWh system shows why that matters," he said. "With Smartstack, Fluence delivers a scalable architecture—more capacity in less space, with the performance, safety, and service model they expect."

To support long-term economic performance, Smartstack and Fluence OS are engineered as a unified hardware-software platform. This integration enables advanced controls, system-level optimization, and portfolio visibility. Fluence reports a 99.3% availability across reviewed fleets of 50 MW and above, per an independent review, providing contractual confidence for mission-critical deployments.

Smartstack Platform Specifications

Smartstack is commercially available for grid-scale applications worldwide.

Fluence Energy, Inc. announced that an independent review by DNV confirmed 99.3% availability across its reviewed operating battery energy storage fleets of 50 MW and above. The assessment validated Fluence's internal findings of 98.7% MW-weighted availability across the reviewed global fleet, providing a benchmark for performance in the energy storage industry.

DNV reviewed Fluence-provided fleet-level availability data, calculation methodologies incorporated into contracts, and operational data for select projects. The study assessed fleet-level availability using operational data, applied a consistent methodology across markets and operating environments, and included independent evaluation of underlying assumptions, methodology, and results.

Industry Performance Context

Across the energy storage industry, availability figures of 95% to 98% are often promoted. However, definitions and measurement approaches vary, which can make it difficult for customers, investors, and asset owners to compare performance across suppliers. Customers experience performance in practical terms by a system's operational availability to deliver energy on demand.

Commercial Impact

The commercial impact of availability can be significant. Even small differences in availability can affect project revenue, operating costs, and long-term asset value, particularly as storage assets operate across different markets, duty cycles, and conditions. The review represents one of the industry's more comprehensive independent assessments of fleet-level battery storage availability.

Key Metrics

As power demand grows from electrification, industrial load, and AI data centers, independently reviewed operating data can help customers distinguish which storage assets are built to deliver dependable, flexible capacity at scale.