Assuming the most common Dark Energy models, it's density remains constant even with the universe expansion. As new space volume is created, it contains the same amount of dark energy as the previously existing space for the same volume unit. If we assume that at a certain epoch of cosmic time, say 13 billion years elapsed from the Big Bang, the universe is finite in volume and time (we opt to dismiss the block-time view), this means that the amount of dark energy contained in the universe at that epoch is finite. But if the universe is expanding and accelerating as it is currently mostly believed, it should mean that the expansion will continue forever towards infinity, therefore also Dark Energy will need to be created in infinite quantity. Where does the additional dark energy contained in newly created space come from? Doesn't this violate the principle of conservation of energy? And eventually in case of infinite expansion, how can infinite energy become available to fill up all that space?