Abstract: A method and system for dynamic demand aggregation at one or more grouped sites wherein each grouped site includes one or more devices. Within each group, each device is in communication with one of more local controllers which, in turn, are in communication with an aggregator and the demand response repository. The local controller controls and coordinates the operation of the devices based on instructions received from the aggregator. The aggregator dynamically receives information from the demand response repository which is continuously updated with information from the signal handler and the local controllers at the grouped sites.