 Since physicists abhor infinities in their calculations, and "r" is always non-zero in practice, the choice of formula_36 at infinity is by far the more preferable choice, even if the idea of negative energy in a gravity well appears to be peculiar at first.The negative value for gravitational energy also has deeper implications that make it seem more reasonable in cosmological calculations where the total energy of the universe can meaningfully be considered; see inflation theory for more on this.Gravitational potential energy has a number of practical uses, notably the generation of pumped-storage hydroelectricity.