This project aims to develop a simulator to hybridize an urban solid waste incineration plant using a waste-to-energy approach. The Rankine cycle is powered by the heat released by burning waste and the overheating and reheating of steam are assured by the gas cycle. The hybridization consists in using solar collectors to apply the thermal energy from solar radiation to mitigate part of the gas cycle s demand. This work pursues to evaluate not only sustainability, but also the financial return of the hybridization. On the hybrid plant, the thermal efficiency increased from 28 per cent to 32 per cent . There was also a subtle rise in the ecological efficiency (from 89 per cent to 90 per cent). Financially, the payback obtained was 5 years.