Halki (Greek: Χάλκη; alternatively Chalce or Chalki) is a Greek island and municipality in the Dodecanese archipelago in the Aegean Sea, some 9 km (6 mi) west of Rhodes. With an area of 28km² (11 sq mi), it is the smallest inhabited island of the Dodecanese. It is part of the Rhodes regional unit. It has a permanent population of 330 (increased during the summer months), concentrated in the only village Emporio.
In April 2022, Chalki started a project to electrify its transport by changing to electric cars. Along with the cars, the island also builds a PV plant that is aimed to provide electricity to all its inhabitants. This project is part of the Greek government's initiative aiming to transform Greek islands into models of green economy, energy autonomy and eco-mobility starting with smaller and non-interconnected islands.