Solartwin - reliable, quickly fitted and affordable solar water heating system. It is based on a Scottish engineer's sudden insight on how to avoid the problem of frozen pipes bursting in winter - by just letting them freeze - flexibly!

Renewable devices - company that provides renewable energy solutions to domestic and business customers.

AES solar - manufacturer, design, and install high efficiency solar hot water systems for domestic and commercial applications. Systems are also available as DIY kits.up.

Energy Saving Trust - non-profit organisation funded by governments and the private sector focussing on delivering practical energy saving solutions for households, small firms and the road transport sector. Source for solar grants in UK

siGEN – the foremost commercial Fuel Cell company in Scotland. Designing and implementing commercial Fuel Cell power solutions

Scoraig Wind Electric – Wester Ross based writer, manufacturer, lecturer / consultant on wind and water power.

BP Solar - Manufacturers of high quality solar panels.