Active Power, a division of Piller Power Systems Inc., is a leading producer of kinetic energy storage systems. Our flywheel technology provides permanent energy storage that helps solve customer problems and provides a lower total cost of ownership, higher reliability, and more sustainable solutions.

In November 2016 Piller Power Systems Inc, the US subsidiary of Piller Group GmbH, acquired the business and assets of Active Power Inc. Piller Group GmbH is a division of the UK based engineering and industrial group, Langley Holdings plc