It releases energy. We see that this process is in fact thermodynamically stable and the energy of the product is lower than the energy of the reactants. And in fact, about half of the energy, half of the free energy that is released in the defasphorylation of this ATP molecule is stored inside this protein phosphoryl group complex. So defosphorylation of ATP is a very exergonic reaction and it releases a large amount of free energy and that's precisely why this reaction itself is thermodynamically stable. In fact, because the products are so much more stable than the reactants. This reaction ultimately takes place in a single direction.