Agios Efstratios is a small Greek island in the northeastern Aegean Sea. It has 250 people. Before, it got all its electricity from fuels like oil. Now, wind and sun provide 91% of its electricity. This change keeps about 1,000 tons of carbon dioxide gas out of the air each year.
The European Union helped pay for the project. The island uses batteries to store extra electricity. They give power back when wind and sun do not make enough. In winter, extra power heats water. Four large tanks store this hot water for heating. One local man says the heating is quiet and cheap to use. The project is a model for other Greek islands.
