  We investigate the charged scalar field propagating in a (2+1) charged BTZ
black hole. The conditions for stability are studied unveiling, for each black
hole geometry, the existence of a critical scalar charge as of the evolution is
unstable. The existence of growing profiles is substantiated by the deep in the
effective potential that intensifies as the scalar charge increases. The
phenomenum happens in every black hole geometry even for small geometry charge.
In the small scalar charge regime, the field evolution is stable and in such we
calculate the quasinormal modes.
