  Although the Universe is far from understood, we are fairly confident about
some key features: Special Relativity (SR) describes the kinematics of inertial
frames; General Relativity (GR) explains gravitation; the Universe had a
beginning in time and has been expanding since. Nevertheless it is quite
difficult to see the 'big picture', although the idea of applying GR to the
entire Universe has been very successful with a model emerging that is
consistent with observation. One unpleasant feature of the model is that
cosmological photons appear not to conserve energy, and the only explanation
forthcoming is the claim that GR is exempt from the principle of energy
conservation. It is demonstrated here that cosmological observations may
legitimately be projected onto flat spacetime and can then be treated Special
Relativistically, whereupon energy conservation is restored. This is not to say
that the concordance General Relativistic cosmological model is incorrect, just
that in observational terms there is no energy conservation anomaly.
