text: how dark energy will cause universe expansion for ever? will it not get depleted? logically any energy source should get depleted over the period of time.how dark energy is exempted? dark energy do not have a source. for all matter around us, 99.997% is dark or hyper-dark energy, while the rest consist of the gases, plasma material, and other uncommon states of matter like the einstein-bosse condense. dark energy is all around the universe, it cannot be depleted as even black holes cannot absorb dark energy, as it is a dark energy itself. so, it is nothing to lose some sleep and to worry about. let the universe decides its own future.