A provisioning system for providing an electrical power, in particular for providing a balancing power, to a power grid, comprising - a first device for providing an electrical power; - a second device for providing an electrical power, wherein - the first device has a) a first measuring device for measuring a control parameter of the power grid and b) a first local control device for controlling a power provided to the power grid by the first device in dependence on the measured control parameter; and at least one first further parameter that represents an operating point of the second device is stored in the first control device and the first control device is configured also to control the power provided by the first device in dependence on the first further parameter; and wherein - the second device has a) a second measuring device for measuring the control parameter of the power grid and b) a second local control device, different from the first local control device, to control a power provided to the power grid by the second device in dependence on the measured control parameter; wherein a mathematical model for the second device is stored in the first control device and the parameter stored in the first control device is derived from the mathematical model in dependence on the measured control parameter, characterized in that at least the second device comprises an energy storage device and an energetic loss occurring in the energy storage device is specified in the mathematical model for an operation of the energy storage device, said mathematical model being stored in the control device that is associated with the first device, to balance the energetic loss occurring in the energy storage device by power delivery or power provision of the first device. - a first device for providing an electrical power; - a second device for providing an electrical power, wherein - the first device has a) a first measuring device for measuring a control parameter of the power grid and b) a first local control device for controlling a power provided to the power grid by the first device in dependence on the measured control parameter; and at least one first further parameter that represents an operating point of the second device is stored in the first control device and the first control device is configured also to control the power provided by the first device in dependence on the first further parameter; and wherein - the second device has a) a second measuring device for measuring the control parameter of the power grid and b) a second local control device, different from the first local control device, to control a power provided to the power grid by the second device in dependence on the measured control parameter; wherein a mathematical model for the second device is stored in the first control device and the parameter stored in the first control device is derived from the mathematical model in dependence on the measured control parameter, characterized in that at least the second device comprises an energy storage device and an energetic loss occurring in the energy storage device is specified in the mathematical model for an operation of the energy storage device, said mathematical model being stored in the control device that is associated with the first device, to balance the energetic loss occurring in the energy storage device by power delivery or power provision of the first device.