Gravestone Windmill

With the ever increasing amount of space being taken up by cemetaries that have no real use to the living aside from remembering those that have departed, why not attach electricity generating windmills to each gravestone. Gravestones these days seem to be rather stable, especially the rather large ones. Attaching windmills to them via a metal pole in the ground held up by suspension cables (such as large broadcast towers have) would generate enough power for a number of uses. Maybe have a small computer, powered by the windmill, in the gravestone listing the deceased person's life story. My original use for the gravestone-windmill was to electrocute/shock vandals about to harm the grave. But until I can figure out a way to distinguish vandals from mourners, I shall have to go with this less harmful version.