The big blue panels that you may observe on the roofs of an increasing number of homes are photovoltaic (PV) panels. These devices convert the energy from the sun into electricity. An electronic device ('inverter') converts this solar electricity to convenient 230V AC and that powers the appliances inside the home: refrigerator, light bulbs, stereo sets, TV, PC, name it. The PV system is via my home connected with the public electricity supply, the power grid. Hence the name grid-connected PV. Does one ever run out of power? Quite the contrary. On sunny days, when local use is low, excess electricity streams back into the grid. You may call this 'export'. At night or when clouds obscure the sun, electrical power is drawn from the public grid to power the appliances inside the home. Call this 'import'. Take my own situation as an example. I enjoy a drastically reduced electricity utility bill. The reason for this is simple: electricity bill = import minus export. The policy is called 'net-metering'. I am using less juice from the power company than my neighbour because my home generates its own stuff. Fantastic! Carbon dioxide emissions are reduced at the same time. PV-generated electricity is supergreen and superclean. Is this renewable energy produced right where it is needed.

How do these installations work, what do they cost and what do they yield? Does it make sense for us to install solar panels on our homes, and what is the effect for the community at large? Who manufactures these panels? Does the government provide grants, and does one need a building permit to install solar panels on the roof of his home? Where can you get additional information? This website tries to provide some answers.