This Universe only has one basic source of power and it is Nuclear. Stars fuse lightweight elements into slightly heavier elements and supernovas fuse those atoms into all the rest of the naturally occurring elements of the periodic chart. The heavier elements clump together (gravity) and create gradients which give rise to potential energy from gravity, but it was the mass generated by stars that allow that. Gravitational stress heats the mantel of the Earth and allows us to harvest some geothermal power. Other geothermal power is directly harvested from the temperature difference between the Earth's Sun warmed surface and the constant temperature layer of soil several meters down. Solar,wind, and hydro power are indirect methods of harvesting the fusion power of the Sun. Burning coal, oil, gas, alcohol, or other biomass is simply using the Sun's power that was harvested by plants and stored as hydrocarbons. And then there are our feeble attempts at nuclear power using fission.
As we ween ourselves from carbon based fuels we need to keep in mind that none of the so called 'renewable' sources of energy actually are renewable: they all depend on the continuous output of that nuclear furnace we call the Sun.