That is the concept. The term "renewable" connotes that we can use a source of such energy over and over without depleting that source (in any near future time).
Sun, tides, and wind sources are prime examples of renewable energy sources. We will have the Sun, oceans, and winds over eons, which is to say forever for all practical purposes. So the energies they can and do provide are renewable.
Nuclear energy by fission is also considered renewable by some. And I suppose it is as there seems to be a lot of pitchblende and other uranium ores on planet Earth to exploit. So I suspect planet Earth could run a long long time on nuclear fission energy.
But it's such a dirty energy source as the spent nuclear material remains toxic for literally centuries. It's so bad that it has to be buried in remote areas of the planet and one has to hope those areas do not have some sort of accident that spreads that toxicity throughout the land.
My point is that renewable energy sources should serve humankind well for eons, but they should be clean energy sources, not dirty.