The first law of thermo-dynamics says that the total amount of energy on our planet remains constant. The second law states that as forms of energy are expended they become less easily available.
That is entropy: the slow winding down of available energy.
Renewable energy: a sweet harvest. When you burn coal, gas or oil you rapidly convert a relatively easily available, concentrated source of energy into a much less available form: dispersed exhaust gases.
A highly concentrated energy source, built up over millions of years quickly gone up in smoke!
So, burning fossil fuels is a high-entropy way of using energy.
Using renewable energy however merely taps into a natural flow of energy, sunlight, moving water, wind, biological- or geothermal processes. These are part of natural cycles of highs and lows.
Their energy is truly renewable as it remains available to the same degree and is not depleted any more than it otherwise would by using it—an advantage of renewable energy that we have discussed.
This is a low-entropy way of using energy.
An advantage of renewable energy therefore is that it requires us to rise to the occasion, and to bring out our best inner resources.