Answer
Tere is no restriction on the energy or momentum of a particle according to the theory or relativity.
Work Step by Step
According to the theory of relativity, no particle can move faster than light. On the other hand, there is no restriction on the energy or momentum of a particle. Both momentum and energy of a particle approach "infinity" as the speed of the particle approaches the maximum speed $c$. Thus a particle can have an arbitrarily large energy/momentum as its speed approaches closer to the maximum value $c$.
