Scalable energy storage systems for data centers FlexGen designs, deploys, and manages scalable energy storage solutions that help data centers meet the power demands of AI and high-density computing. Talk to an Expert Design for your site Quickly and predictably achieve goals with a system that conforms to your needs. FlexGen optimizes the design of each system to meet your unique project, market and grid requirements. Deploy faster and more predictably FlexGen One Touch Commissioning™ accelerates deployment while lowering project risks through our unique pre-integration process. FlexGen’s Innovation Lab pre-integrates controls and uncovers issues before deployment - removing surprises and keeping your project on track. Manage operations and maximize performance FlexGen HybridOS™ offers EMS software, proven microgrid controls and multi-asset orchestration capabilities - all in one platform. While our 24/7 remote operations center monitors your site seamlessly, and Lifecycle Services team support long-term system availability and overall performance. Solved: The Biggest Data Center Power Challenges FlexGen guides customers to the right solution for protecting equipment with AI load smoothing, supporting grid stability with low-voltage ride-through, and orchestrating all on-site generation for reliable, long-term performance. Grid-forming inverters and EMS Execute on AI load-smoothing strategies AI inference workloads draw dense, sustained power that stresses grid capacity. AI training workloads ramp up and down in milliseconds, destabilizing on-site generation and upstream power sources. FlexGen delivers BESS with grid-forming power conversion system (PCS) that handles both, absorbing training transients instantly and maintaining a smooth, predictable profile for inference loads upstream. Grid-forming power conversion Millisecond transient load absorption Ramp-rate, state-of-charge, and energy reserve management Sophisticated control narratives Ride through grid disturbances (LVRT) When grid voltage drops, data centers need to address two challenges: protecting their sensitive equipment from poor power quality coming from the grid, and protecting the grid by remaining connected and avoiding the sudden loss of their massive demand from the grid. FlexGen combines battery storage, PCS, and HybridOS™ controls to ride through grid disturbances. Low-voltage and frequency ride-through (LVRT/FRT) Fast active and reactive power support to maintain power quality Grid stability through controlled ramp-rates and load response Microgrid Controls Orchestrate onsite generation, maintaining optimal bands Without coordinated control, conflicts between batteries, generators, and variable generation assets cause instability and unplanned outages. HybridOS™ EMS acts as the intelligent brain of your campus, coordinating every asset in real time so your data center stays online no matter what the grid does. Site-level microgrid orchestration Islanding and seamless grid-to-island transition Black start and grid resynchronization Low-voltage ride-through (LVRT) Medium Voltage UPS Functionality that scales as future power density increases AI workloads demand power at a density and speed that legacy UPS systems were never built to handle, forcing data centers to oversize, incur redundancy costs, and sacrifice energy efficiency at scale. FlexGen HybridOS™ integrates UPS, power conditioning and site-level controls into a single platform for AI data centers. Maintain uptime through grid disturbances and power transfers Reduce in-building UPS hardware, costs, and energy losses Scale power capacity as AI density increases The Data Center Power Playbook Dive into the technical data center power challenges and how battery energy storage systems (BESS) address them. Download Whitepapers HybridOS™: the orchestration layer for the hyperscale era AI inference and training workloads don't follow a schedule, and they will only continue to scale. Whether you're a neocloud operator standing up your first campus or a hyperscale facility managing gigawatts, HybridOS™ continuously orchestrates every energy asset on your campus, so your data center stays online no matter what the grid does. Learn more about HybridOS™ Peak Demand Management HybridOS™ automatically manages state-of-charge thresholds to discharge batteries during periods of high electricity demand to reduce peak consumption charges and grid exposure. Power Balancing Dynamic coordination of generation and load across multiple energy assets. HybridOS™ continuously evaluates asset availability and operating limits to determine optimal real-time dispatch under all conditions. Islanding & Seamless Transition HybridOS™ enables automatic isolation from the grid during disturbances, maintaining continuity of data center operations without service interruption. Grid Resynchronization HybridOS™ monitors grid voltage, frequency, and phase angle in real time, executing resynchronization at precisely the right moment to prevent transient disturbances to critical data center loads. Black Start Manage transformer inrush current, sequence the energization of auxiliary systems, and coordinate the startup of large gas turbines or other generation assets before they assume control of voltage and frequency. Low Voltage Ride-Through Modern BESS power conversion systems ride through short-duration voltage events — critical as regulators increasingly require large loads to remain online during disturbances, preventing gigawatt-scale load loss. Watch our latest video where we explore approaches to voltage ride-through for data centers, from increasing the voltage tolerance of equipment to using battery energy storage systems (BESS). Lifecycle services that protect your BESS investment Reduce downtime through proactive monitoring, predictive analytics, and rapid-response remote operations. FlexGen builds flexible solutions tailored to your power needs, ensuring your BESS investment continues to perform and is ready to adapt. Explore Lifecycle Services 24/7 remote ops with real-time dashboards and digital twin benchmarking Predictive, preventative, and corrective maintenance programs Dedicated asset management and performance oversight The most BESS-dedicated field technicians with regional coverage across a global footprint 17 years of experience across energy markets 200+ Projects completed. Serving customers with unique needs including developers, IPPs, EPCs, utilities, munis, co-ops, data centers and more. 25+ GWh completed and under contract. That’s enough storage capacity to provide electricity to 5 million average U.S. homes for 4 hours. 10+ Countries with active and contracted deployments. FlexGen supports a variety of energy projects across all 10 U.S. markets and internationally. 13 Million hours of runtime. HybridOS’ single codebase is built off and improves from the cumulative experiences of 200+ global projects and 80+ equipment configurations. Related resources Results Whitepaper Orchestrating grid, battery storage, generators, and solar in real time Learn More Whitepaper Accelerating time to power for AI infrastructure Learn More Whitepaper How battery-centric architectures support data center growth Learn More Whitepaper Battery Energy Storage Systems for AI Data Centers Learn More Ready to solve data center power challenges? Learn how FlexGen can guide and enhance your data center power strategies. The right lifecycle partner improves uptime, grid stability, and long-term ROI. Talk to an Expert Frequently Asked Questions How long does FlexGen take to deploy a BESS for a data center? FlexGen’s data center solutions are purpose-built for hyper-scale campuses and neocloud operators building net-new AI infrastructure. We can deploy campus-scale battery storage in under a year, which is significantly faster than grid interconnection timelines of 4-8 years. Can BESS replace a UPS for AI workloads? Yes. Utility-scale 4-hour batteries provide millisecond response, unified backup, ride-through, and peak management in a single system, eliminating UPS oversizing costs and limitations. What is HybridOS™ EMS, and do I need it? HybridOS™ EMS is FlexGen's solution for high-performance management of energy storage assets. It's a modular software platform that orchestrates batteries, generators, and variable generation assets in real time. For AI data centers running cloud infrastructure, inference, and training workloads, it's essential for grid stability and uptime. Does FlexGen handle interconnection agreements? Yes. FlexGen's engineering team produces the power studies and modeling required to accelerate utility interconnection, local permitting, and financing approvals. What does it mean that FlexGen is “software-forward”? HybridOS™ is the constant across every project. Rather than being locked into a single hardware vendor, FlexGen validates across 80+ battery and PCS configurations. That means that your campus gets the right equipment for your exact use case, timeline, and supply chain constraints, all running on proven software. What cybersecurity certifications does FlexGen hold? FlexGen holds ISO 27001:2022 and ISO 27001:2013 certifications and has completed a NIS 2 Directive assessment. HybridOS™ is US-built, with security-first architecture designed for critical infrastructure environments. For the full certificate stack, visit trust.flexgen.com.
