Note that general relativity requires you to precisely locate all (non-gravitational) energy contributions as they determine spacetime curvature. So while eg th

Note that general relativity requires you to precisely locate all (non-gravitational) energy contributions as they determine spacetime curvature. So while eg the electrostatic potential has an arbitrary zero point, the energy density of the electromagnetic field has not. The only exception to that is gravitational energy, which cannot entirely be localized.