Concentrated solar therman power would be a benign type of energy that can actually replace nuclear reactors.
All that is needed is a sunny location and concentrating mirrors. The heat achievable is several hundred degrees, quite comparable to that generated in nuclear reactors. It can therefore drive the same type of steam turbines and electric generators.
The most important thing about the sun's energy is its abundance. In just six hours, more energy from the sun reaches the Earth's deserts than is consumed by all of humanity in an entire year. Consequently, it would take a relatively small area of desert land to produce all the electric power the world consumes.