A modest PV system only adds about $110/month to your mortgage and pays for itself during the life of the mortgage Similar dollar investments go into a car, but solar electricity pays you every month in savings on utility bills. Solar increases the value and resale opportunities of your home. Your solar equipment has value independent of your house. You could sell it or take it with you when you move. Solar equipment protects you from rate increases & fuel cost uncertainties. This may be an issue when electric competition begins in Arizona.6) Take advantage of state income tax credit and exemption from state sales tax. Use of solar may help decrease air pollution problems related to burning fossil fuels. Utility companies have much higher operational and maintenance cost with fossil fuel generated power than with solar. This eventually costs you. EPA/DOE studies indicate that the value of a home increases from $11 to $25 for every $1 reduction in annual utility bills.