solar energy
The great advantage of solar is in making a householder individually sustainable and responsible for their energy consumption with virtually no running costs and no environmental consequences in their use.
You don't need a sunny climate for them to have a significant impact on reducing a household's energy costs. Even on cloudy days in Cornwall there is plenty of light for PV cells to generate electricity.
The panels are connected through your meter to the National Grid and you are then paid for any electricity from your panels that you don't use.
A Solar PV installation
in Penwith
Solar Slates at Carnyorth
Covering a relatively small area of the Sahara dessert (approx 600 square miles) would generate all the World's electricity requirements.