What are those big blue panels doing on the roofs of an increasing number of homes? These are photovoltaic (PV) panels that convert the energy from the sun directly into electricity. An electronic device ('inverter') converts the PV-electricity to 230V AC and that powers the appliances inside my home: refrigerator, light bulbs, stereo sets, TV, PC, name it. The system is connected with the public elec- tricity 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 is fed back into the grid. Call this 'export'. At night or when clouds obscure the sun, electrical power is drawn from the public grid to power my appliances. Call this 'import'. I enjoy a drastically reduced electricity utility bill. The reason for this is simple: electricity bill = import minus export. 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 or isn't it?

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 answers.