You Do Need power plug adapter while traveling from Guyana to Ireland (Eire).

Here is Why You Need An Adapter

The outlet and plug type used in Ireland (Eire) is G and in Guyana are A, B, D and G. This is how they look like.

Guyana

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

Type A

Type B

Type D

Type G

Ireland (Eire)

In Ireland (Eire), outlets of type G are in use.

Type G