Solar power is one form of renewable energy that is replacing fossil fuels
If you want to understand the revolution taking place in renewable energy, come to a power station called Gemasolar in southern Spain.
Here, in the dusty plains of Andalusia, they have worked out how to generate solar power 24 hours a day.
Yes, you can read that sentence again. At Gemasolar they create electricity even when the Sun is not shining.
They have rigged up more than 2,500 huge mirrors on hydraulic mounts that follow the Sun’s passage through the sky.
The mirrors – each about the size of half a tennis court – reflect the Sun’s rays to one central point, the top of a 140m (459ft) tower, where molten salt is heated to almost 600C. This liquid salt is carried down the tower to where it heats the steam that powers a turbine.