Hydro, wind and solar are all powered by the Sun.
The sun heats air, generating wind.
The sun heats water, causing evaporation and then rain that falls in the mountains for hydro.
This. Get the power right from the source. Even nuclear fission power comes from heavy elements fused at the center of the sun and spat out during an early nova outburst.
But direct solar power it getting more interesting just in recent years, the cost of solar power has come down from "astronomical" (as in it was only cost effective for satellites) to "competitive with fossil fuels" :