You Do Need power plug adapter while traveling from Saint Vincent and the Grenadines to Bulgaria.

Here is Why You Need An Adapter

The outlet and plug type used in Bulgaria are C and F and in Saint Vincent and the Grenadines are A, B and G. This is how they look like.

Saint Vincent and the Grenadines

In Saint Vincent and the Grenadines, outlets of type A, B and G are in use.

Type A

Type B

Type G

Bulgaria

In Bulgaria, outlets of type C and F are in use.

Type C

Type F