Wind technology at the Centre for Alternative...
Railway tracks of the Llwyngwern quarry, which...
The water balanced cliff railway at the Centre...
The Centre for Alternative Technology, Corris
Early days at the Centre for Alternative...
External insulation on a traditional slate...
View of Llwyngwern quarry, which closed in 1951...
A quarryman at Llwyngwern quarry, which closed...
A solar roof at the Centre for Alternative...
A roofing module covered with solar cells to...
The Centre for Alternative Technology van
Engineers from the Centre for Alternative...
Mealtime at the Centre for Alternative Technology
Installing solar panels at the Centre for...
A wood gas burner being heaved into place at...
David Bellamy gets stuck in at the Centre of...
Prince Charles on a visit to the Centre of...
The vegetable plot at the Centre of Alternative...
