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

Here is Why You Need An Adapter

The outlet and plug type used in Portugal are C and F and in Ireland (Eire) is G. This is how they look like.

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

Type G

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

Type C

Type F

I am from

going to