This is really interesting, SOLAR TOWER, using the heating power from the sun to heat up a flat land of air and then channel the hot air into a chimney. In this chimney, there is a huge turbine, and this turbine will turn a generator to produce electricity.
You might think that this will only work in the day but you are wrong, the heat from the ground will reheat the air and channel it back to the chimney.
Its a pilot project by a german company, build in Spain. It is not an officially working plant and the system doesn’t produce a lot of power (maybe enough to power a hundred homes) but the interesting thing is, the chimney is very cheap (comparing to a powerplant) to build, the whole project cost about a million dollar.