A distributive transmission and distribution power grid control system, comprising: a transmission and distribution power grid including a plurality of distributed energy resources wherein a subset of the plurality of distributed energy resources are controllable; a control engine; a simulation engine operable to produce a model of operational and control response characteristics of the transmission and distribution power grid including the plurality of distributed energy resources and the subset of the plurality of distributed energy resources are controllable; a control interface communicatively coupled between the control engine and the simulation engine and the plurality of distributed energy resources, the control interface being configured to receive a request for specified performance of a portion of the transmission and distribution power grid, the system being configured to effect, prior to issuing commands to selected ones of the plurality of distributed energy resources to provide the requested specified performance to direct the simulation engine to determine whether meeting such a request is feasible and if so, what commands must be issued to the plurality of distributed energy resources to produce such requested specified performance; and on determination that meeting the request is feasible, the system is configured to deploy validated commands to direct production of the requested specified performance and wherein during deployment the commands are implemented and the power system characteristics are monitored to validate both the simulation and the developed commands and effect modifications are made to both the commands and the simulation as required. a transmission and distribution power grid including a plurality of distributed energy resources wherein a subset of the plurality of distributed energy resources are controllable; a control engine; a simulation engine operable to produce a model of operational and control response characteristics of the transmission and distribution power grid including the plurality of distributed energy resources and the subset of the plurality of distributed energy resources are controllable; a control interface communicatively coupled between the control engine and the simulation engine and the plurality of distributed energy resources, the control interface being configured to receive a request for specified performance of a portion of the transmission and distribution power grid, the system being configured to effect, prior to issuing commands to selected ones of the plurality of distributed energy resources to provide the requested specified performance to direct the simulation engine to determine whether meeting such a request is feasible and if so, what commands must be issued to the plurality of distributed energy resources to produce such requested specified performance; and on determination that meeting the request is feasible, the system is configured to deploy validated commands to direct production of the requested specified performance and wherein during deployment the commands are implemented and the power system characteristics are monitored to validate both the simulation and the developed commands and effect modifications are made to both the commands and the simulation as required.