Wind power is a hotly debated and contentious issue on Öland, with critics saying the new plants would threaten the world heritage status of the island.
The proposal to expand wind power has been appealed several times and could be appealed again.
"It would really surprise me if the proposal is not appealed this time, too," local government commissioner Henrik Yngvesson told Swedish Television.
Öland is Sweden's second largest island. The agriculture landscape of southern Öland is a UNESCO world heritage site.