General Information
Energy Saving Trust - Non-profit organisation offering impartial advice on renewable energy systems
Renewable Energy Association - Promotes sustainable energy in the UK

Our Solar Future - Solar Trade Association, industry trade body

Photovoltaic
Energy Saving Trust - overview of photovoltaic solar panels
Sharp - UK manufacturers of photovoltaic solar panels
Kyocera - manufacturers of photovoltaic solar panels

Government
Microgeneration Certification Scheme

DECC - Department of Energy & Climate Change