PUERTOLLANO, CIUDAD REAL CASTIL, SPAIN - JUNE 13: The King of the Netherlands, Willem-Alexander (r), signs the visitors' book at the Puertollano green hydrogen plant, on 13 June, 2023 in Puertollano, Ciudad Real, Castilla-La Mancha, Spain. This visit is part of Guillermo Alejandro's visit this week to see several hydrogen projects in the country. The focus of the visit is hydrogen and its future use in energy production. The visit of the Dutch monarch to Spain includes trips to Castilla-La Mancha and Andalusia. (Photo By Eusebio Garcia del Castillo/Europa Press via Getty Images)
