Piller, a global leader in mission-critical power infrastructure, is playing a central role in one of Europe’s largest AI data center expansion projects, supplying over 200 of its Active Power CleanSource® battery-free uninterruptible power supply (UPS) systems to Nebius’s Mäntsälä facility in Finland.
Nebius, a leading global AI infrastructure provider headquartered in Amsterdam, is expanding the capacity of its Mäntsälä data center up to 75MW, reflecting accelerating demand for AI compute. Piller’s technology has been selected to help support the high levels of reliability, responsiveness and energy efficiency required by large-scale AI deployments.
Clean Power for Intensive AI Loads
AI workloads are highly resource intensive and demand continuous uptime, low-latency power protection, as well as infrastructure that can respond rapidly to load changes. Active Power’s CleanSource® battery-free UPS is specifically engineered for these challenges, offering unmatched power density, minimal lifecycle costs and enhanced sustainability compared to conventional battery-based systems.
Several hundred CleanSource® UPS units will be deployed at the Mäntsälä site during 2025. The UPS systems are manufactured at Piller’s Active Power factory in Austin, Texas, where production has been scaled up to meet the requirements of this high-volume project.
Energy Efficiency
For Piller, the Mäntsälä deployment represents a significant contribution to one of the most advanced AI infrastructures in Europe. The project not only demonstrates the technical capability of CleanSource® UPS at scale but also aligns with the company’s broader goals of enabling energy-efficient, sustainable digital infrastructure worldwide. The CleanSource® UPS supports this by eliminating toxic batteries, reducing energy losses and delivering long-lasting, high-efficiency performance – directly contributing to the data center’s mission to minimize environmental impact and advance low-carbon operations.
Nebius’s Mäntsälä data center integrates several progressive energy strategies, including:
- A Power Usage Effectiveness (PUE) as low as 1.1 under peak loads.
- Heat recovery systems that supply excess thermal energy to local communities.
- A shift away from battery-based energy storage, reducing environmental impact and maintenance overhead.
By contributing to this advanced, large-scale facility, Piller is helping to define the next generation of power protection for AI and high-performance computing environments.
About Piller
Piller power conditioning and backup technology can be found in major mission-critical power applications globally. For many of the world’s banks and financial institutions, governmental agencies, data centre operators, telecoms networks and airports, as well as hospitals, semiconductor and pharmaceutical manufacturers, Piller equipment is the go-to technology.
Piller was founded by Anton Piller in Hamburg in 1909. Today the company is headquartered in Osterode, near Hanover in Germany, with subsidiaries across Europe, in the USA, India, Asia and Australia. The company employs around 1,000 people worldwide.
In 2016 Piller acquired the Austin TX kinetic energy storage producer, Active Power Inc.
Piller Group GmbH is a wholly owned subsidiary of the UK engineering and industrial group, Langley Holdings plc and is part of the Power Solutions Division together with Bergen Engines AS and Marelli Motori Srl.
