Actually, that 4.3¢ represents the value of the energy produced by the solar panel. Since it only produced 0.5 kWh of energy, that would place the implied energy price at 8.6¢ per kWh for that table. Click on the link at the beginning of that line (the number "9") and it will bring up the eia/doe national data for the retail price of electricity. Their current data shows the average U.S. residential price at 9.4¢ per kWh (up from 8.6¢), and the average California residential price at 12.1¢ per kWh.
Keep in mind that ultimately it is YOU who are paying that subsidy to yourself via the utility fund established by your friendly legislature!!! (TANSTAAFL)
But as to your "five year" payback projection, I think you're going to have to go back and recalculate that based on the info I included at the beginning of this post. It won't be anything like five years! In addition, pay special attention to note 11 at the bottom of that table. You'd be lucky to pay for it before the solar cells die of old age!
BTW, if you are considering a roof top installation, do you mind telling me in which direction the sloped side of your roof faces? Even better would be to check it with a magnetic compass and report the result in degrees. Do any trees, buildings or hills shadow your roof at any time?
All mostly true...but I am planning a move to an area that gets frequent power outages, and I was planning on a solar installation anyway...so if I am paying a surcharge/tax anyway, and I didn't get a chance to say no to this plan, I might as well take advantage of it! ;-)