You Do Need power plug adapter while traveling from Dominican Republic to Equatorial Guinea.

Here is Why You Need An Adapter

The outlet and plug type used in Equatorial Guinea 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

Equatorial Guinea

In Equatorial Guinea, outlets of type C and E are in use.

Type C

Type E