Renewable is a misnomer. It implies the "energy" can be returned to its preused state and used again. Wind, solar, rivers, that isn't true. Once a "unit" of such power is used it is moved on. A more correct term is "perpetual" because more of it comes on and on, versus oil or coal which is very finite. However, even perpetual energy will "end." Of course when wind, solar and rivers end, it pretty much means the earth and we have ended.