Renewable energy technologies harness natural resources to generate power sustainably. **Solar energy** utilizes photovoltaic cells to convert sunlight into electricity and solar thermal systems to capture heat. **Wind energy** relies on wind turbines to convert wind into electrical power. **Hydropower** generates energy from flowing water, typically using dams or turbines. **Geothermal energy** taps into Earth's internal heat to produce electricity and provide heating. **Biomass** involves burning organic materials or converting them into biofuels. **Ocean energy**, including tidal and wave power, captures energy from sea movements. These technologies reduce greenhouse gas emissions, promote energy security, and support sustainable development.