The present invention is an apparatus for optimizing security constrained dispatch and pricing for the wholesale energy trading market. The imbalance market uniquely requires a real-time market for bidding and for providing the energy generation adjustments required to satisfy the imbalance. The present invention address the above noted needs by providing a real-time imbalance engine to support and implement the equitable imbalance requirement via a computer system implementation. Additionally, the present invention allows the market generators and loads to provide electronic bids for resolution while considering constraints on the demand and supply system.