The sustainable development goals (SDGs) are fundamental to circular economy, climate action, sustainable digital environment initiatives that addresses the higher need of shifting towards fully sustainable and renewable energy systems. The decentralized power system has been applied and interconnected to the system and accounting to the renewable energy mix, energy storage and distribution. A decentralized hybrid renewable energy system can be of much help in providing a deficit of power between energy generation and demand where a single renewable energy system is not sustainable and reliable. The aim of this study was to characterize the biomass, perform the biomethane potential test of the biomass, select suitable bio-digester using multi-criteria decision analysis, carry out simulation-modelling of the solar-anaerobic digestion system in achieving energy self-efficiency with the development of the dynamic models that of climatic condition, social-economic and technology feasible. The performance of the system was designed and optimised to get maximum output power and mitigation of the environment at a lower cost. The performance was analysed based on present cost, locally availability, environmentally friendly, cost of energy on the local tariffs, load satisfaction, fuel consumption savings, operation and maintenance cost, human and technology capital and pollutants saving rates. The results showed major energy consummation from the solar-biodigester system, technology solutions that maximize energy efficiency and reduce the heat loss in the AD process. Waste to energy (WtE) technology coupled with the solar system could be viewed as key to sustainable, affordable and clean electricity generation.