La ville de Vienne en Autriche a éclairée une rue importante à l’aide d’un dispositif appelé arbre solaire (« solar tree ») pendant un projet pilote de 4 semaines en octobre.
[Renewable] The solar trees went on display for four weeks in October on a busy street — the Ringstrasse — in Vienna, Austria. They were able to provide enough light during the night-time even when the sun did not show for as much as four days in a row. « The solar cells on the tree were able to store enough electricity in spite of receiving no direct solar light for days at a time because of the clouds. They showed that solar trees really are a practical form of street lighting