mtu Kinetic PowerPack
https://www.mtu-solutions.com/eu/en/applications/power-generation/power-generation-products/mtu-kinetic-powerpack.html
Answering your specific power, footprint, and sustainability needs, mtu Kinetic PowerPacks provide a competitive alternative compared to static UPS systems. The dynamic UPS technology is based on kinetic energy and consists of a diesel engine coupled to a kinetic energy accu via an electromagnetic clutch. mtu Kinetic PowerPacks ensure reliable
and environmentally friendly uninterruptible electrical power and power conditioning. Without the need for batteries, the system offers the highest power density (kW/m²) in the industry with a high system efficiency in conditioning mode, low total cost of ownership, small footprint, scalable solutions, and a compact design.