This brief explores how bio-inspired and biomimetic design principles are transforming next-generation nanoenergy technologies, highlighting recent advances in hybrid nanomaterial systems for solar-driven CO2 reduction, triboelectric and multifunctional energy harvesters, and gel-based and graphene-enhanced materials engineered for high-performance energy applications. It examines how nature-inspired approaches enable integrated self-powered systems from smart wearables to off-grid rural solutions, while also addressing the sustainability, life-cycle, and environmental implications of deploying these emerging energy materials. It is a useful resource for graduates, researchers and professionals working in the next generation energy materials.