Caetano H2.City Gold
This bus is considered the first bus in Spain that runs with hydrogen! There are several news about it, as well as a video on Youtube.
For now the bus company is testing it, and it was brought from Portugal, hence why it has Portuguese plates instead of Spanish plates.
(Update as of February 2022: There is now a similar bus running permanently on lines 4 and 6. It's registered in Spain under 0518 LVY.)
In Torrejón de Ardoz, Spain
#ALSA