In this modern era, it’s quite difficult to imagine our society without plastics. Nowadays consumption as well as production of polymers are increased which creates huge amount of polymer waste creating environmental problems. There are various routes to convert the waste to energy in terms of fuels which mainly involves pyrolysis, thermal or catalytic degradation, energy incineration etc. This mini review mainly deals with application of heterogeneous catalysts in gasification of various wastes. Apart from it many basic concepts in field of waste to energy conversion are also discussed.