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

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G 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

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G