FlexGen and Rosendin Partner to Deliver Battery-Based UPS for Next-Gen Data Centers

Published: 06 Jun 2025

Author: Precedence Research

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FlexGen Power Systems and Rosendin, one of the largest employee-owned electrical contractors in the country. They have partnered to build a unique utility-scale Battery Energy Storage System (BESS) for data centers. Blending FlexGen’s unique Soft Grid Interconnection and Island Grid Transient Frequency Stabilization with Rosendin’s BESSUPS architecture helps provide a modern option that uses batteries instead of diesel and UPS to protect critical functions.

This system, handled by HybridOS software, is set up outside the medium-voltage range of 1,000V to 35,000V, making installing and lowering capital expenses easier. It makes it possible for energy to be injected back into the grid, giving the ability to provide grid-forming, dispatchable power. Tests are being carried out to check this combined battery energy system serves mission-critical power smoothly and switches between normal grid and independent standby operation with no disturbance.

Key Highlights

Smart Energy Management

• Powered by FlexGen’s HybridOS energy software for real-time monitoring and control.
• Offers dispatchable power that can be returned to the grid when not used.

Future-Ready for AI and Hyperscale Computing

• Built to handle dynamic, high-density workloads common in AI-powered data centers.
• Supports firmware-based adaptability to rapidly evolving computing demands.

Ongoing Testing & Validation

• Real-world tests examine how existing grid-forming PCS technologies support critical data center functions.
• It aims to ensure firmware upgrades can enable seamless replacement of traditional UPS.

Executive’s Statements

Pasi Taimela, Chief Innovation Officer, FlexGen

“As data centers scale to meet exponential demand from AI and hyperscale computing, we must rethink how we deliver power resilience across the modern data center campus. This effort with Rosendin enables us to bring to market a smarter, leaner, and more responsive approach to data center energy design that doesn’t require any redesigns inside the data center walls one where battery systems provide both power quality and grid services without compromise.”