  The paper deals with the definition of gravitational energy in conformal
teleparallel gravity. The total energy is defined by means of the field
equations which allow a local conservation law. Then such an expression is
analyzed for a homogeneous and isotropic Universe. This model is implemented by
the Friedmann-Robertson-Walker (FRW) line element. The energy of the universe
in the absence of matter is identified with the dark energy, however it can be
expanded for curved models defining such an energy as the difference between
the total energy and the energy of the perfect fluid which is the matter field
in the FRW model.
