Also don't forget to factor in that a lot of government entities directly subsidize solar power installations or other renewable sourced energy. (It doesn't make sense to me mathematically, but I am not a government).
So on a 12kW system that I just got installed, I receive 30% back as a government tax credit. I also receive a specific subsidy based on the number of kWh my solar power produces - regardless of whether or not I consume the kWh. Versus normal electric even with just the net metering I wind up saving 0.06USD/kWh.