The Centre For Alternative Technology (CAT)
Searching the Treehugger archives for the keyword “Wales” brought a respectable number of results - although you’ll always get a fair number of Australian results in there for good luck! (due to New South Wales).
Treehugger, being an environment blog, had to pick up on Wales’ best known environmental establishment: The Centre for Alternative Technology, in Powys. CAT aims to ‘inspire, inform, and enable’ people to live more sustainably. Founded in 1973 near Machynlleth, the Visitor Centre opened in 1975 and had been informing and educating people from around the world ever since.
Link: Treehugger post
Link: CAT

