Electricity produced here was also used to power the Long Wave Wireless Telegraph transmitting station built by Marconi in 1912 near Waunfawr.
Pobol y Cwm | Cwm, Llanrothal | Ysgol Gyfun Cwm Rhymni | Llyn Cwm-y-ffynnon | Cwm Twrch | Cwm Penmachno | Cwm Idwal |