You Do Need power plug adapter while traveling from Cocos (Keeling) Islands to Åland Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Åland Islands are C and F and in Cocos (Keeling) Islands is I. This is how they look like.

Cocos (Keeling) Islands

In Cocos (Keeling) Islands, outlets of type I are in use.

Type I

Åland Islands

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

Type C

Type F