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A status report is given of a program to develop a flywheel energy storage system at the Delft University of Technology. The aim is to assess the feasibility of a flywheel system for (quasi)stationary applications. A test facility has been constructed for testing flywheel systems up to energies of 10 kWh under vacuum .Several types of flywheels wil be tested, i.e. laminated fibre wheels, wound fibre wheels, and isotropic laval discs. A switch mode convertor is applied to transfer energy to and from the user. Rotating parts are in vacuum. Active magnetic bearings are used with permanent magnets incorporated, forming virtually a zero power system in the equilibrium position. A complet energy storage system with an energy content of 10 kWh and a power of 10 kW is due late 1980. (Wassmann)