Site controllers of distributed energy resources

A site controller of an electrical system of a site, the site controller comprising:

• a central interface configured to communicate with a central controller;
• a control interface configured to communicate with one or more distributed energy resources (DERs) of the electrical system, each of the one or more DERs controllable by one or more control values of one or more control variables delivered to the one or more DERs through the control interface;
• and
• one or more processors configured to:
• process a proposed site change in power by the one or more DERs, the proposed site change in power received from the central controller and comprising one or more of provision of electrical power and reduction of consumption of electrical power during a proposed period of time;
• determine a predicted impact of implementing the proposed site change in power over the proposed period of time, wherein to determine a cost of operation, the one or more processors predict local load and generation during a time period by:
• performing an estimation from historic observed load values to determine an average load shape representing a historic average profile,
• determining a scale and an offset, wherein the offset corresponds to a shift from an interpolated value from the average load shape to a current observed load value, and
• generating a corrected load shape for a future period based on the scale and the offset as applied to the load shape;
• and
• generate an impact response message and transmit the impact response message to the central controller through the central interface to indicate the predicted impact;
• and
• control operation of at least a DER of the one or more DERs using at least a committed engagement rule set received from the central controller, wherein the committed engagement rule set is generated by the central controller based on the impact response message and predicted impact indicated.