Which renewable energy source relies on harnessing the sun's rays?

Solar energy harnesses the sun's rays to generate electricity or heat, making it a key renewable energy source. This process typically involves the use of solar panels that convert sunlight directly into electrical energy through photovoltaic cells or utilizes solar thermal systems to capture heat for residential or industrial usage. Solar energy is abundant and sustainable, contributing to the reduction of greenhouse gas emissions and reliance on fossil fuels. This reliance on the sun sets it apart from the other energy sources listed, which utilize different natural phenomena or materials. Hydroelectric energy specifically involves the movement of water, wind energy captures air flow, and biomass energy is derived from organic materials, all of which do not directly utilize solar rays for their energy generation.