Gas turbine power plant with improved flexibility

The plant (100) has a water-steam-circuit (10) heat technically connected with a gas turbine (1) such that exhaust gas delivered out from the turbine during operating the turbine transfers heat to the water-steam-circuit for steam generation. The water-steam-circuit is heat technically connected with a heat storage (20). The heat storage is heat technically connected with a container (30) for storing water. The container is fluid technically coupled with a combustion chamber (6) of the turbine such that the water is supplied from the container to the turbine during operating the turbine. The container is a pressurized water container. An independent claim is also included for a method for flexible operation of a gas turbine power plant.