You Do Need power plug adapter while traveling from Solomon Islands to Azores.

Here is Why You Need An Adapter

The outlet and plug type used in Azores are B, C and F and in Solomon Islands are G and I. This is how they look like.

Solomon Islands

In Solomon Islands, outlets of type G and I are in use.

Type G

Type I

Azores

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

Type B

Type C

Type F