  We introduce a naturally-defined totally invariant spacetime energy
expression for general relativity incorporating the contribution from gravity.
The extension links seamlessly to the action integral for the gravitational
field. The demand that the general expression for arbitrary systems reduces to
the Tolman integral in the case of stationary bounded distributions, leads to
the matter-localized Ricci integral for energy-momentum in support of the
energy localization hypothesis. The role of the observer is addressed and as an
extension of the special relativistic case, the field of observers comoving
with the matter is seen to compute the intrinsic global energy of a system. The
new localized energy supports the Bonnor claim that the Szekeres collapsing
dust solutions are energy-conserving. It is suggested that in the extreme of
strong gravity, the Heisenberg Uncertainty Principle be generalized in terms of
spacetime energy-momentum.
