If you just need a lot of heat, then you can use the sunlight directly by focusing it with mirrors: * https://en.wikipedia.org/wiki/Solar_furnace https://en.wi

If you just need a lot of heat, then you can use the sunlight directly by focusing it with mirrors: * https://en.wikipedia.org/wiki/Solar_furnace https://en.wikipedia.org/wiki/Solar_furnace * https://www.youtube.com/watch?v=bEvbj3O_yt8 https://www.youtube.com/watch?v=bEvbj3O_yt8 * http://www.theatlantic.com/technology/archive/2014/04/this-sun-powered-furnace-can-reach-3-000-degrees/360423/ http://www.theatlantic.com/technology/archive/2014/04/this-s...