The plant was opened on the 80s, but the picture is probably a recent one.
Source: The untold story of the architect who turned Spain’s modernist power plants into art
Image caption:
Aboño thermal power plant, Aboño valley between the municipalities of Gijón and Carreño, opened 1980, owned by EDP. Photography: Luis Asín
From the article:
Deep in the Cantabrian Mountains, some 150 kilometres away from his hometown Oviedo in northern Spain, a young Joaquín Vaquero Palacios (1900-1998) used to travel around on horseback with his father, one of the founders of the Hidroeléctrica del Cantábrico company (now part of the EDP group). (…)
Found via cassette futurism collection (Samuel, Pinterest)
Spanish Wikipedia: Joaquín Vaquero Palacios
maybe because they were built in the 80s when bright primary colors were king and a windowless concrete cavern is hopelessly dreadful?
Green is a secondary color