PV is coming down in cost precipitously. Energy companies are buying huge PV farms. Their cost of energy will drop. Utilities are regulated to limit their rate

PV is coming down in cost precipitously. Energy companies are buying huge PV farms. Their cost of energy will drop. Utilities are regulated to limit their rates to guarantee minimum profitability, so their price must be correlated to their cost. Ergo, electricity costs will drop. Your rooftop PV system is never going to be much cheaper, if ever cheaper at all, than the electricity that the utility will provide from utility scale PV that has been installed much more cheaply, and much more optimized than the arbitrary orientation of your roof.