Windmills solar pannals what kind of power is that?

Question

You know when you have a word on the tip of your tounge and cant get it. Well thats what im having a problem with. I know its something like natural energy or something like that.

Answer 1

Also Clean Energy or Green Energy

Answer 2

You mean renewable energy, something that does not consume the source of the energy?  Also covers geothermal, hydroelectric, that sort of thing?