Method for starting a pressure storage plant

A method for activating a pressure storage plant, the pressure storage plant comprising:

• a storage volume for a pressurized storage fluid, a storage fluid expansion machine capable of being acted upon solely by the pressurized storage fluid, and a generator which is arranged with the expansion machine on a common power train, and said method comprising bringing the expansion machine to an operating rotational speed, synchronizing the generator with an electricity network and operating the expansion machine for the output of power into the electricity network, a first storage fluid mass flow (mHEX) being extracted from the storage volume, and at least one partial mass flow of the first storage fluid mass flow being provided as a second storage fluid mass flow (mAT) for the storage fluid expansion machine and being expanded in the storage fluid expansion machine with the output of power, characterized in that, during the acceleration of the storage fluid expansion machine, the generator is operated at least temporarily electromotively to assist the acceleration of the storage fluid expansion machine.