Pen y Dre High School in Merthyr was the first Net Zero Carbon school to supply excess electricity to a nearby hospital (Prince Charles).
Ysgol Uwchradd Pen y Dre ym Merthyr oedd yr ysgol Carbon Sero Net gyntaf i gyflenwi trydan dros ben i ysbyty cyfagos (Ysbyty'r Tywysog Siarl).