Nanomaterial-based hybrid energy systems represent a transformative advancement in next-generation power generation, storage, and optimization technologies, enabling unprecedented improvements in efficiency, sustainability, and scalability across diverse energy applications. Traditional energy systems, including fossil fuel-based power generation and conventional renewable technologies, often suffer from inefficiencies arising from energy loss, limited storage capabilities, and suboptimal material performance. The integration of nanomaterials—such as graphene, carbon nanotubes, quantum dots, metal–organic frameworks, and nanostructured semiconductors—into hybrid energy architectures has significantly enhanced energy conversion efficiency, charge transport, thermal management, and system durability. This paper proposes an advanced modeling framework that combines nanomaterial engineering with hybrid energy system architectures, including solar–thermal, photovoltaic–battery, fuel cell–supercapacitor, and thermoelectric–storage integrations. The study leverages computational modeling techniques such as multi-scale simulation, machine learning-based optimization, and physics-informed neural networks to analyze system performance under varying operational conditions. The proposed framework evaluates energy efficiency, power density, lifecycle sustainability, and real-time adaptability across nanomaterial-enabled hybrid systems. By integrating advanced materials science with intelligent energy modeling, this research contributes to the development of high-efficiency, low-loss, and adaptive power systems suitable for smart grids, electric mobility, wearable devices, and decentralized energy networks. The findings establish a foundation for next-generation energy systems that combine nanoscale material innovation with large-scale energy optimization strategies.