Grestonspey was a nuclear power plant located in Scotland. It was the most advanced of its kind on Earth.
In the 1970s, the Third Doctor and UNIT investigated mysterious power losses and strange lights in the sky near Grestonspey. The Doctor discovered the power station was being drained of energy by the Zeld, who had set up an underground base ten miles away. (PROSE: The Ghouls of Grestonspey)