You Do Need power plug adapter while traveling from Central African Republic to Saint Lucia.

Here is Why You Need An Adapter

The outlet and plug type used in Saint Lucia is G and in Central African Republic are C and E. This is how they look like.

Central African Republic

In Central African Republic, outlets of type C and E are in use.

Type C

Type E

Saint Lucia

In Saint Lucia, outlets of type G are in use.

Type G