How do the non-conventional sources of energy score over the conventional sources of energy?

The non-conventional sources of energy score over the conventional sources of energy in following ways:

1. These sources of energy are available freely and in abundance. In fact they are 'renewable' so there is no fear of them getting exhausted or depleted.
2. They are environment friendly and do not produce any waste or cause pollution.
3. They can be tapped at large scale at one place or in small amount at number of places at the same time, including remote and inaccessible areas like hilly terrains, deep forests or deserts.
4. When situated close to load centres, they can result in reduction of overall cost of electricity generation, making it cost effective.