Post-use disposal of non-biodegradable plastic waste is a major challenge world-wide resulting in unprecedented accumulation of plastic waste in the environment. This poses hazards to the environment and health of human beings. Solutions to this challenge are still being sought. In this study, therefore, the feasibility of employing plastic waste energy recovery process as a plastic waste management tool was investigated and optimised. Polypropylene, polyethylene, and a mixture of the two plastics were used in the investigation. Energy recovery was done using the pyrolysis process. The Taguchi method was used for process optimisation and parameter design. Feedstock composition, temperature and heating rate are the parameters investigated. The energy was recovered in liquid form as oil. Optimum conditions were found using polypropylene plastic and a temperature of 500 ^oC and a heating rate of 15 ^oC/min were found to be the optimum conditions. Parameter interaction analysis showed increase in the oil yield as temperature increased from 450 °C to 500 °C, after which the yield decreased.