The concept of zero-point energy, as a phenomena of quantum mechanics, is in fact accepted by physicists and is not considered controversial. The most accessible example of zero-point energy is the vacuum. A vacuum is simply the ground state -- point of lowest possible energy -- of all the fields in space.
The zero-point energy of a system fluctuates naturally, giving it a wave-like nature.
On the next page, learn about an unusual application for zero-point energy