Renewable energy is still science-fiction. Renewables technology is ready to go, and is working reliably in countries around the world. South Africa has some of the best renewable resources in the world as it has one of the highest and most stable solar radiations in the world.
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Thus, it is fortunate that our Sun is not more massive than it is since high mass stars rapidly exhaust their core hydrogen supply. Once a star exhausts its core hydrogen supply, the star becomes redder, larger, and more luminous: it becomes a red giant star.or a given chemical composition and stellar age, a stars' luminosity, the total energy radiated by the star per unit time, depends only on its mass. Stars that are ten times more massive than the Sun are over a thousand times more luminous than the Sun.