The interest in porous clay and its modification has been exponentially increasing. The outstanding properties of clay were evident due to high thermal and chemical resistance, as well as high porosity. By virtue of these reasons, modified clay was therefore prepared from many synthetic routes for significant enhancement on specific surface area and porosity. The application of modified clay was versatile in many areas of industrial commercialization. It was related to catalyst support, separation technology, electronic device as well as food packaging. To use modified clay with higher efficiency, it was consequently designed as composite based materials. Small amount of modified clay from chemical synthetic route was therefore integrated into polymer matrix. To be challenge on the use of modified clay based composite, it was investigated for being as energy storage materials. Due to high thermal resistance along with excellent specific surface area and porosity, modified clay was therefore gained many interests. Modified clay based composite will be employed as energy based material with additional feature of flexibility.