Solar Cells, also called photovoltaic convert photons in sunlight into electricity that can be used to power appliances and lights.  With state incentives, federal tax credits, and energy efficient mortgages explore the possibilities of utilizing solar PV  while reducing your operating cost and reducing carbon dioxide emissions.  The systems are modular, therefore you can add onto the systems thus increasing the amount of electricity  you produce.   Net metering allows you to sell excess electricity produced back to the utility company.