An elevator control system includes an elevator group system including one or more elevators and an elevator group controller configured to control operation of the one or more elevators. The system includes at least one of an external elevator management system and an external power provider connected via a data communications link to the elevator group controller. The elevator group controller is configured to transmit to the at least one of the external elevator management system and the external power provider elevator operation information, and the at least one of the external elevator management system and the external power provider is configured to transmit to the elevator group controller elevator operation control information based on the elevator operation information. The elevator group controller is configured to then control operation of the one or more elevators based on the elevator operation control information.