  In this article, we consider the Alcubierre spacetime, such a spacetime
describes a ``bubble'' that propagates with arbitrary global velocity. This
setting allows movement at a speed greater than that of light. There are some
known problems with this metric, e.g., the source's negative energy and the
violation of the source's energy conservation when the bubble accelerates. We
address these two issues within the realm of the Teleparallel Equivalent of
General Relativity (TEGR). The energy conservation problem can be solved when
considering the energy of the gravitational field itself. The total energy of
the spacetime, gravitational plus source, is conserved even in accelerated
motion. We explicitly show the dependence of energy and gravitational energy
flux on the frame of reference, one adapted to a static observer and the other
to a free-falling one in the same coordinate system. Addressing the problem of
energy negativity of the source, we find that a static observer measures
positive energy of the source, while an Eulerian observer measures a negative
one. Thus, we surmise that negative energy may be a reference problem.
