You Do Need power plug adapter while traveling from Balearic Islands to Cuba.

Here is Why You Need An Adapter

The outlet and plug type used in Cuba are A, B, C and L and in Balearic Islands are C and F. This is how they look like.

Balearic Islands

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

Type C

Type F

Cuba

In Cuba, outlets of type A, B, C and L are in use.

Type A

Type B

Type C

Type L