You Do Need power plug adapter while traveling from Dominican Republic to Saint Barthélemy.

Here is Why You Need An Adapter

The outlet and plug type used in Saint Barthélemy are C and E and in Dominican Republic are A, B and C. This is how they look like.

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

Saint Barthélemy

In Saint Barthélemy, outlets of type C and E are in use.

Type C

Type E