Electrical and thermal energy have wide applications for the future of mankind. A solar photovoltaic thermal system is a hybrid system, which can produce both thermal and electrical energy. Chennai has an appropriate climate and is highly suitable for using photovoltaic thermal hybrid systems. This article presents the mathematical analyses of the thermal, electrical, and exergetic performance of a photovoltaic thermal system augmented by a flat plate collector for a typical domestic application. The system is found to have 11% average electrical efficiency, 15% overall exergy efficiency, and 56% overall energy efficiency.