Laboratories such as JET (fusion research) use them, because they cannot draw enough power from the grid: https://www.euro-fusion.org/fusion/jet-tech/jets-flywh

Laboratories such as JET (fusion research) use them, because they cannot draw enough power from the grid: https://www.euro-fusion.org/fusion/jet-tech/jets-flywheels/ https://www.euro-fusion.org/fusion/jet-tech/jets-flywheels/