The Centre for Alternative Technology (CAT) () is an eco-centre in Powys, mid-Wales, dedicated to demonstrating and teaching sustainable development. CAT, despite its name, no longer concentrates its efforts exclusively on alternative technology, but provides information on all aspects of sustainable living. It is open to visitors, offers postgraduate degrees as well as shorter residential and one day courses; and publishes information on renewable energy, sustainable architecture, organic farming, gardening, and sustainable living. CAT also runs education programmes for schools and sells environmentally friendly items through its on site shop, restaurant and mail order department. History CAT was founded by businessman-turned-environmentalist Gerard Morgan-Grenville, and opened in 1973 in the disused Llwyngwern slate quarry near Machynlleth (once served by the narrow-gauge Corris Railway), where it occupies a seven-acre (28,000 m2) site. The organisation was originally known as the "British National Centre for the development of Alternative Technology". Inspiration for the early CAT pioneers included the then-recent books Small Is Beautiful, A Blueprint for Survival, and The Limits to Growth as well as an aim to explore alternative ways of living. CAT was previously aligned to the Urban Centre for Appropriate Technology (UCAT), which was based in Bristol and has since evolved into the Centre for Sustainable Energy. David Lea and Pat Borer won the Gold Medal for Architecture at the National Eisteddfod of Wales of 2001 for their work on the WISE building at the CAT. Visitor centre In 1975 a permanent exhibition opened in order to generate wider interest. The site with of interactive displays is the largest tourist attraction in the area. It is open all-year except Christmas, seven days a week. It is a registered charity. The facilities and exhibits include: the water-balanced CAT funicular, the Centre for Alternative Technology Railway solar, hydropower and wind power a low-energy house a site-wide electricity grid powered by renewable energy displays of organic gardening methods a hydraulic ram pump strawbale and rammed earth buildings Britain's largest green bookshop Vegetarian/vegan restaurant Events, activities and courses that take place throughout the year Education The centre offers a range of courses which are between a day and a week in length. Some of these courses are offered to the general public while others are accredited courses for professional installers. CAT is involved with school education through training teachers, producing materials and offering special tours and materials on site. The Centre includes a Graduate School