It is much more sustainable, although of course not as cheap as mining using non-renewable energy sources. The issue with its cost is not permanent however as the more people and institutions that are into renewable energy resources, the more will people they implement them as part of their everyday lives and in turn, this upstart in usage will drop the price down, possibly cheaper than non-renewable variations. And of course most importantly, the renewable energy sources are much more safer for its users and are not polluting the environment. So there's a big plus on that.