In this paper, we propose an intelligent approach to power system stabilization using a Wide Area System Centric Controller and Observer (WASCCO). This architecture augments local controllers connected to generators such as Power System Stabilizers (PSS) based on Intelligent Supervisory Loop (ISL) concept implemented with WASCCO. For the monitoring and control of multiple generators a Dual Heuristic Programming (DHP) action-critic neural network architecture is utilized. This coupled with a predictive Wide Area Neural Network Identifier (WANNID) generates a control signal to augment local controller. The controller performance is tested on a five generator, eight buses, two area power network to damp inter-area model oscillations. Also an intelligent agent cluster is designed at major power system buses that interact with WASCCO. Simulation studies indicate that the proposed controller is capable of improving the stabilization of the generator.